Publications

2023

KUIPER T, HAUSSMANN S, WHITFIELD S, ALTWEGG R, SHAW J, POLAKOW DA, FERREIRA S, HOFMEYR M.

Evaluating the cost and effectiveness of rhino conservation interventions in the Greater Kruger.

2023: 15 pp.

ODENDAAL HJ, GEERTS LTGM, WRIGHT CA, ROBERTS DJ, SCHUBERT P, BOYD T, BRINK LT, NEL DG.

Association of Placental Histology with the Pulsatility Index of Fetal and Uteroplacental Vessels during Pregnancy and with Birthweight Z-Score.

Medical Research Archives 2023; 11(8):1-17.

ZAFAR S, CHEEMA S, BEH EJ, HUDSON I.L

Asymptotic Characteristics of the Non-Iterative Estimates of the Linear-by-Linear Association Parameter for Ordinal Log-Linear Models.

Computation 2022; 10(12):0.

VAN STRYP O, AFRICA EK, KIDD M, DUNCAN MJ.

The effect of active brain-breaks during a typical school day on the in-school physical activity patterns of Grade 1 children in the Western Cape, South Africa.

Education 3-13 2023; 51(3):398-409.

VAN DER WESTHUIZEN CS, HEUVELINK GBM, HOFMEYR DP.

Multivariate random forest for digital soil mapping.

Geoderma 2023; 431(https://doi.org/10.1016/j.geoderma.2023.116365):0.

VAN DER WATT ASJ, KIDD M, ROOS A, LESCH E, SEEDAT S.

Romantic relationship dissolutions are significantly associated with posttraumatic stress symptoms as compared to a DSM-5 Criterion A event: a case-case–control comparison.

European Journal of Psychotraumatology 2023; 14(2):2238585, 18 pages.

TERBLANCHE N, WALLIS GP, KIDD M.

Talk or Text? The Role of Communication Modalities in the Adoption of a Non-directive, Goal-Attainment Coaching Chatbot.

INTERACTING WITH COMPUTERS 2023; 35(4):511-518.

STEYN ML, DE WET T, DE BAETS B, LUCA S.

A Nearest Neighbor Open-Set Classifier based on Excesses of Distance Ratios.

JOURNAL OF COMPUTATIONAL AND GRAPHICAL STATISTICS 2023; 32(1): 319–328.

SNYMAN LC, RICHTER KL, LUKHWARENI A, DREYER GJ, BOTHA MH, VAN DER MERWE F, VISSER C, DREYER G.

Cytology compared with Hybrid Capture 2 human papilloma virus cervical cancer screening in HIV positive and HIV negative South African women.

International Journal of Gynecological Cancer 2023; 33:669-675.

SMIT Y, EBRAHIM Z, MARAIS ML, NEL DG, KOEN N.

Does sugar taxation on sugar-sweetened beverages alter purchasing behaviour of South African consumers? Perspectives of dietitians and key role-players.

South African Journal of Clinical Nutrition 2023; 0(0):8 pages.

2022

ALFEUS M, HE X, ZHU S

An Empirical Analysis of Option pricing with Short Sell Bans.

International journal of theoretical and applied finance 2022; 25(3):2250012, 26 pages.

ALFEUS M, HE X, ZHU S.

Regularization effect on model calibration.

Journal of Risk 2022; 24(3):1-27.

ALFEUS M, NIKITOPOULOS C.

Forecasting volatility in commodity markets with long-memory models.

Journal of Commodity Markets 2022; 28:100248, 29 pages.

BEH EJ, LOMBARDO R.

Visualising Departures from Symmetry and Bowker’s X2 Statistic.

Symmetry-Basel 2022; 14:1103, 25 pages.

BRINK LT, ROBERTS DJ, WRIGHT CA, NEL DG, SCHUBERT P, BOYD T, HALL DR, ODENDAAL HJ.

Piatrogenic preterm birth: Different entities with unique pathologic features.

Placenta 2022; 126:54-63.

BRINK LT, SPRINGER PE, NEL DG, POTTER MD, ODENDAAL HJ.

The tragedy of smoking, alcohol, andmultiple substance use during pregnancy.

SAMJ South African Medical Journal 2022; 112(8):526-538.

BROCKER E, OLFF M, SULIMAN S, KIDD M, MQAISI B, GREYVENSTEIN L, KILIAN S, SEEDAT S.

Aclinician-monitored ‘PTSD Coach’ intervention: findings from two pilot feasibility and acceptability studies in aresource-constrained setting.

European Journal of Psychotraumatology 2022; 13:2107359, 13 pages.

CALLE-TORO J S, ELSINGERGY M, DENNIS R, GRASSI D, KIDD M, OTERO HJ, ANDRONIKOU S.

Frequency of duodenal anatomical variants in neonatal and pediatric upper gastrointestinal tract series (UGI)and the influence of exam quality on diagnostic reporting of these.

CLINICAL IMAGING 2022; 87:28-33.

CORNELISSEN RJ, KIDD M, ALEIXANDRE TUDO JL, NIEUWOUDT H.

Data-driven Determination of Disease Markers’ Threshold Values in Rot-affected Wine Grapes.

South African Journal of Enology and Viticulture 2022; 43(1):85-95.

DREYER G, SNYMAN LC, VAN DER MERWE F, RICHTER KL, DREYER GJ, VISSER C, BOTHA MH.

Phase I of the DiaVACCS screening trial: Study design, methods, population demographics and baseline results.

SAMJ South African Medical Journal 2022; 112(7):478-486.

2021

RODWELL DT, VAN DER MERWE CJ, LUBBE S.

Categorical CVA biplots

Computational Statistics and Data Analysis 2021; 163(107299):?.

OLIVIER SE, DE WAARD L, MULLER CJB, GEBHARDT GS.

Delivery outcomes of patients with pre-eclampsia at 27 – 34 weeks’ gestation at Tygerberg Hospital, Cape Town, South Africa: A retrospective observational study

SAMJ South African Medical Journal 2021; 111(5):437-443

LUBBE S, FILZMOSER P, TEMPL M.

Comparison of zero replacement strategies for compositional data with large numbers of zeros

CHEMOMETRICS AND INTELLIGENT LABORATORY SYSTEMS 2021; 210:1-11.

LUBBE S.

Linear discriminant analysis for multiple functional data analysis

JOURNAL OF APPLIED STATISTICS 2021; 48(11):1917-1933

HOFMEYR DP.

Fast Exact Evaluation of Univariate Kernel Sums

IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE 2021; 43 (doi.org/10.1109/ TPAMI.2019.2930501):447-458.

DE VRIES PJ, LECLEZIO L, LUBBE S, KRUEGER D, SAHIN M, SPARAGANA S, DE WAELE L, JANSEN A.

Multivariate data analysis identifies natural clusters of Tuberous Sclerosis Complex Associated Neuropsychiatric Disorders (TAND)

Orphanet Journal of Rare Diseases 2021; 16 (447):1-10.

ALFEUS M, KANNAN S.

Pricing Exotic Derivatives for Cryptocurrency Assets—A Monte Carlo Perspective

Journal of Mathematical Sciences 2021; 11(4):597-619.

ALFEUS M, HE X, ZHU S.

Regularization effect on model calibration

Journal of Risk 2021; 24 (3):1-27.

2020

BEIRLANT J, BUITENDAG S, DEL BARRIO E, HALLIN M.

Center-outward quantiles and the measurement of multivariate risk

INSURANCE MATHEMATICS & ECONOMICS 2020; 95:79-100.

BUITENDAG S, BEIRLANT J, DE WET T.

Confidence intervals for extreme Pareto-type quantiles

SCANDINAVIAN JOURNAL OF STATISTICS 2020;47:36-55.

DE WET T, ÖSTERREICHER F, THALER M.

Tsallis’ Entropies – Axionatics, Associated ƒ-Divergences and Fisher’s Information

South African Statistical Journal 2020;54(2):163-175.

HOFMEYR DP.

Connecting spectral clustering to maximum margins and level sets

JOURNAL OF MACHINE LEARNING RESEARCH 2020; 21(18):1-35.

HOFMEYR DP.

Degrees of freedom and model selection for -k-means clustering

Computational Statistics and Data Analysis 2020; 149:106974, 14 pages.

KAMPER F, STEEL SJ, DU PREEZ JA.

Regularized Gaussian Belief Propagation with Nodes of Arbitrary Size

JOURNAL OF MACHINE LEARNING RESEARCH 2020; 21(101):1-42.

KATANGWE TJ, VAN TOORN R, SOLOMONS RS, DONALD A, STEEL SJ, SPRINGER PE, KRUGER M. A.

South African cerebral palsy registry is needed

SAMJ South African Medical Journal 2020; 110(5):353-354.

LANGENEGGER EJ, HALL DR, HARVEY J.

The impact of an obstetrician-led, labor ward critical care unit: A prospective comparison of outcomes before and after establishment

Obstetric Medicine 2020; 13(3):132-136.

LUUS R, NEETHLING A, DE WET T.

Prediction error estimation of the survey-weighted least squares model under complex sampling

South African Statistical Journal 2020; 54(2):187-205.

MINKAH R, DE WET T.

Constant versus Covariate Dependent Threshold in the Peaks-Over Threshold Method

Journal of Applied Probability and Statistics 2020; 15(3):27-48.

2019

ABDULGADER S, RAMJITH J, ROBBERTS L, NDURU PM, DUBE F, LUBBE S, ZAR H, NICOL MP.

Longitudinal Population Dynamics of Staphylococcus aureus in the Nasopharynx During the First Year of Life

Frontiers in Genetics 2019; 10:1-10.

BIERMAN S.

Interpretable multi-label classification by means of multivariate linear regression

South African Statistical Journal 2019; 53(1):1-13.

DU PLESSIS N, MULLER CJB, AVENANT T, PEPPER MS, GOGA A.

An Early Infant HIV Risk Score for Targeted HIV testing at Birth

PEDIATRICS 2019; 143(6):2018-3834.

BUITENDAG S, BEIRLANT J, DE WET T.

Ridge Regression Estimators for the Extreme Value Index

EXTREMES 2019; 22, 271-292.

MINKAH R, DE WET T.

Comparison of Confidence Interval Estimators: An Index Approach

JOURNAL OF APPLIED PROBABILITY AND STATISTICS 2019; 14 (1), 31-55.

VAN DER SPUY P, LENNER R, DE WET T, CAPRANI C.

Multiple Lane Reduction Factors Based on Multiple Lane Weigh in Motion Data Structures

STRUCTURES 2019; 20, 543-549.

HOFMEYR DP, PAVLIDIS NG, ECKLEY IA.

Minimum spectral connectivity for spectral pursuit

STATISTICS AND COMPUTING 2019; 29:391-414.

HOFMEYR DP, PAVLIDIS NG.

PPCI: an R Package for Cluster Identification using Projection Pursuit

R Journal 2019; 11(2):1-25.

HOFMEYR DP.

Improving Spectral Clustering Using the Asymptotic Value of the Normalized Cut

JOURNAL OF COMPUTATIONAL AND GRAPHICAL STATISTICS 2019; 28(4):980-992.

KAJEE Z, HARVEY J, ZÖLLNER EWA.

The impact of a diabetes care team on the glycaemic control of paediatric and adolescent patients with type 1 diabetes mellitus at Tygerberg Children’s Hospital

South African Journal of Child Health 2019; 13(1):11-16.

2018

CLAASSEN-WEITZ S, LUBBE S, NICOL A, BOTHA G, MOUNAUD S, SHANKAR S, NIERMAN WC, MULDER N, BUDREE S, ZAR H, NICOL MP, KABA M.

HIV-exposure, early life feeding practices and delivery mode impacts on faecal bacterial profiles in a South African birth cohort

Scientific Reports 2018; 8(5078):1-15.

GOWER J, LUBBE S, LE ROUX NJ.

Interaction: Fisher’s Optimal Scores Revisited

Journal of Agricultural, Biological, and Environmental Statistics 2018; 23(1):92-112.

HARVEY J, PRETORIUS EJ, ZARRABI AD, GRIFFITH-RICHARDS SB, ACKERMANN HM, MEINTJES CM, CILLIERS WG, DZIKITI S, SZPYTKO AJ, PITCHER RD.

Inter-rater reliability in the radiological classification of renal injuries. World Journal of Urology

WORLD JOURNAL OF UROLOGY 2018; 36(3):489-496.

HARVEY J, VAN DER MERWE AJ.

A Bayesian approach to inference on the variance of lognormal data

South African Statistical Journal 2018; 52(1):29-55.

INNES SEV, HARVEY J, COLLINS IJ, COTTON MF, JUDD A.

Lipoatrophy/lipohypertrophy outcomes after antiretroviral therapy switch in children in the UK/Ireland

PLoS One 2018; 13(4):1-10.

KAMPER F, DU PREEZ JA, STEEL SJ, WAGNER S.

Regularized Gaussian belief propagation

STATISTICS AND COMPUTING 2018; 28(3):653-672.

KOEN N, PHILIPS LA, POTGIETER S, SMIT Y, VAN NIEKERK E, NEL DG, VISSER J.

Staff and student health and wellness at the Faculty of Medicine and Health Sciences, Stellenbosch University: current status and needs assessment

South African Family Practice 2018; 60(3):84-90.

LECLEZIO L, LUBBE S, DE VRIES PJ.

Is it Feasible to Identify Natural Clusters of TSC-Associated Neuropsychiatric Disorders (TAND)?

PEDIATRIC NEUROLOGY 2018; 81:38-44.

MARX M, YOUNG SY, HARVEY J, SEEDAT S.

An examination of differences in psychological resilience between social anxiety disorder and posttraumatic stress disorder in the context of early childhood trauma

Frontiers in Psychology 2018; 8:Article 2058, 9 pages.

PEPLER PT, UYS DW, NEL DG.

Regularized covariance matrix estimation under the common principal components model

COMMUNICATIONS IN STATISTICS-SIMULATION AND COMPUTATION 2018; 47(3):631-643.

2017

BAKK Z, LE ROUX NJ.

Visualizing latent class models with analysis-of-distance biplots

Sociological methodology 2017; 47:345-378.

DE WET T, ÖSTERREICHER F.

A Note on extended Arimoto’s entropies

South African Statistical Journal 2017; 51:285-294.

KAMPER F, DU PREEZ JA, STEEL SJ, WAGNER S.

Regularized Gaussian belief propagation

STATISTICS AND COMPUTING 2017; 1:1-20.

NEL WS, LE ROUX NJ.

An Analyst’s guide to sector-specific optimal peer group variables and multiples in the South African market

Economics, management and financial markets 2017; 1:25-54.

NEL WS, LE ROUX NJ.

The valuation performance of mathematically-optimised, equity-based composite multiples

Journal of Economics, Finance and Administrative Science 2017; 22:224-250.

PEPLER PT, UYS DW, NEL DG.

Discriminant analysis under the common principal components model

COMMUNICATIONS IN STATISTICS-SIMULATION AND COMPUTATION 2017; 46(6):4812-4827.

VILJOEN, H.

A comparison of stepwise common singular spectrum analysis and horizontal multi-channel singular spectrum anlaysis

Communications in Statistics – Simulation and Computation 2017; 46: 6865-6878

2016

BEIRLANT J, BARDOUTSOS A, DE WET T.

Bias reduced tail estimation for censored Pareto type distributions

Statistics and Probability Letters 2016; 109:78-88.

CAEIRO F, GOMES I, BEIRLANT J, DE WET T.

Mean-of-order p reduced-bias extreme value index estimation under a third-order framework

Extremes 2016; 19:561-589.

DE WET T, GOEGEBEUR Y, GUILLOU A, OSMANN M.

Kernel regression with Weibull-type tails

Annals of the Institute of Statistical Mathematics 2016; 68:1135-1162.

DE WET T, ÖSTERREICHER F.

Fisher’s information and the class of f-Divergencies based on extended arimoto’s entropies

South African Statistical Journal 2016; 50:43-64.

GOWER J, LE ROUX NJ, LUBBE S.

Biplots: Qualititative data. Wiley Interdisciplinary Reviews

Computational Statistics 2016; 8:82-111.

​MOSTERT PJ, BEKKER A, ROUX J.

A Bayesian analysis for censored Rayleigh model using a generalised hypergeometric prior

South African Statistical Journal 2016; 50:195-219.

​PEPLER PT, UYS DW, NEL DG.

A Comparison of some methods for the selection of a common eigenvector model of the covariance matrices of two groups

Communications in Statistics - Simulation and Computation 2016; 45:2917-2936.

SCHOONEES PC, LE ROUX NJ, COETZER LJ.

Flexible Graphical Assessment of Experimental Designs in R: The vdg Package

Journal of Statistical Software 2016; 74(3):10.18637/jsss.v074.i03.

STRYDOM ML, CORUBOLO D, NEL C.

Changes in mortality of people living with HIV in South Africa and their potential implications for life assurers

South African Actuarial Journal 2016; 16:1-35.

VAN HEERDEN JD, VAN RENSBURG P.

The impact of liquidity on the cross section of equity returns on the Johannesburg securities exchange

Economics, management and financial markets 2016; 11:59-86.

2015

UYS DW, ALANT EJT.

Estimation of promotion, repetition and dropout rates for learners in South African Schools

Perspectives in Education 2015; 33:20-41.

BADAT F, CHIGIJI K, SÖHNGE J, SUKDEV K, VAN ZYL N.

The evolution and future of social security in Africa: An actuarial perspective

Economia Espanola y Proteccion Social 2015; 7(1889-5956):135-187.

BERNING TL.

Quantification of estimation instability and its application to threshold selection in extremes

South African Statistical Journal 2015; 49(1):35-59

GOWER J, LE ROUX NJ, GARDNER-LUBBE S.

Biplots: Quantitative data

Wiley Interdiciplinary reviews: Computational Statistics 2015; 7:42-62.

GROENEN PJF, LE ROUX NJ, GARDNER-LUBBE S.

Spline-based nonlinear biplots

Advances in Data Analysis and Classification 2015; 9:219-238.

HARVEY J, VAN DER MERWE AJ.

Analysis of unbalanced occupational exposure data using a Bayesian random effects model

South African Statistical Journal 2015; 49:169-185.

MACHEKANO R, YOUNG TN, CONRADIE WJ, RUSAKANIKO S, THABANE L.

Workshop report: building biostatistics capacity in Sub-saharan Africa-taking action

Pan Afrian Medical Journal 2015; 21(167):1-10.

NEL WS, LE ROUX NJ.

An Optimal Peer Group Selection Strategy for Multiples-Based Modelling in the South African Equity Market

Journal of Economics and Behavioral Studies 2015; 7:30-46.

PLANTINGA AA, CORUBOLO D, CLOVER RJ.

Catastrophe modelling: deriving the 1-in-200 year mortality shock for a South African insurer’s capital requirements under Solvency Assessment and Management

South African Actuarial Journal 2015; 39(2):87-103.

VAN HEERDEN JD, VAN RENSBURG P.

The cross-section of Johannesburg Securities Exchange listed equity returns

Studies in Economics and Finance 2015; 32(4):422-444.

2014

DICKS A, CONRADIE WJ, DE WET T.

Value at risk using Garch volatility models augmented with extreme value theory

Studies in Economics and Econometrics (SEE) 2014; 38(3) : 1-18.

DE WET T.

EM-based Likelihood Inference for Some Lifetime Distributions Based on Left Truncated and Right Censored Data and Associated Model Discrimination

South African Statistical Journal 2014; 48(2) : 191-195.

DE WET T, TEUGELS JL, VAN DEVENTER PJU.

Historic bells in Moravian Missions in South Africa’s Western Cape

Historia 2014; 59(2) : 94-119.

HARVEY J, VAN DER MERWE AJ.

Modelling Occupational Exposure Using a Random Effects Model: A Bayesian Approach

South African Statistical Journal 2014; 48 61-71.

COETZER RL, ROUSSOUW RF, LE ROUX NJ.

Reference set selection with generalized orthogonal Procrustes analysis for multivariate statistical process monitoring of multiple production processes

Chemometrics and Intelligent Laboratory Systems 2014; 132 : 52-62.

GOWER JC, LE ROUX NJ, LUBBE S.

The Canonical Analysis of Distance

Journal of Classification 2014; 1(1) : 107-128.

LE ROUX NJ, LUBBE S, GOWER J.

The analysis of distance of grouped data with categorical variables: Categorical conanical variate analysis

Journal of Multivariate Analysis 2014; 132 : 9-24

NEL WS, BRUWER BW, LE ROUX NJ.

Precision, Consistency and Bias in Emerging Equity Markets

Journal of Economics and Behavioral Studies 2014; 6(5) : 386-399.

NEL WS, BRUWER BW, LE ROUX NJ.

An emerging market perspective on peer group selection based on valuation fundamentals

Applied Financial Economics 2014; 24(9) : 621-637.

NEL WS, BRUWER BW, LE ROUX NJ.

The valuation performance of equity-based multiples in South African context

Risk Governance and Control: Financial Markets & Institutions 2014; 3(3) : 35-47.

2013

VAN HEERDEN JD, BOTHA AF.

Measuring the performance of South African equity investment managers using portfolio opportunity distributions

Investment Analysts Journal 2013; 76 : 13-23.

VAN HEERDEN JD, KOEGELENBERG FJ.

Optimal asset allocation strategies for South African pension funds

Journal for Studies in Economics and Econometrics Tydskrif vir Studies in Ekonomie en Ekonometrie 2013; 37(1) : 29-53.

NEL WS, BRUWER BW, LE ROUX NJ.

The impact of Industry classification on the Valuation accuracy of multiples in the South African capital market

International Business and Economics Research Journal 2013; 12(1) : 79-102

NEL WS, BRUWER BW, LE ROUX NJ.

Equity- and Entity-Based multiples in emerging markets: Evidence from the JSE securities exchange

Journal of Applied Business Research 2013; 29(3) : 829-852.

BURGER BV, VIVIERS MZ, LE ROUX NJ, MORRIS J, BEKKER J, LE ROUX M.

Neonatal recognition in sheep

Chemical Signals in Vertebrates 12, New York, USA, Springer-Verlag 2013: 61-76.

VILJOEN H, STEEL SJ.

Identifying secondary series for stepwise common singular spectrum analysis

Journal of the Operations Research Society of South Africa 2013; 29(2) : 155-167.

2012

CONRADIE WJ, DE WET T.

Lulu smoothers on online data

South African Statistical Journal 2012; 46 : 185-220.

VAN DER MERWE CJ, CONRADIE WJ.

Calculation aspects of the European rebalanced basket option using Monte Carlo methods: Valuation

ORiON: Journal of the Operations Research Society of South Africa 2012; 28(1) : 1-18.

DE WET T, GOEGEBEUR Y, GUILLOU A.

Weighted Moment Estimators for the Second Order Scale Parameter

Methodology and Computing in Applied Probability 2012; 14 : 753-783.

DE WET T, GOEGEBEUR Y, MUNCH MR.

Asymptotically unbiased estimation of the second order tail parameter

Statistics & Probability Letters 2012; 82 : 565-573.

DE WET T, TEUGELS JL, VAN DEVENTER PJU.

The Cape Town Carillon: A Forgotten Heritage

South African Journal of Cultural History 2012; 26(2) : 31-60.

GOEGEBEUR Y, DE WET T.

Local Estimation of the Second-Order Parameter in Extreme Value Statistics and Local Unbiased Estimation of the Tail Index

Communications in Statistics-Theory and Methods 2012; 41 : 3575-3607.

GOEGEBEUR Y, DE WET T.

Estimation of the third-order parameter in extreme value statistics

Test 2012; 21 : 330-354.

LUUS R, NEETHLING A, DE WET T.

Effectiveness of Weighting and Bootstrap in the Estimation of Welfare Indices under Complex Sampling

South African Statistical Journal 2012; 46 : 85-114.

COETZER RL, ROUSSOUW RF, LE ROUX NJ.

Efficient maximum distance designs for experiments in mixtures

Journal of Applied Statistics 2012; 39(9) : 1939-1951.

LOUW N.

Robust kernel fisher discriminant analysis with weighted kernels.

South African Statistical Journal 2012; 46 : 267-298.

2011

STEEL SJ, LOUW N, BIERMAN S.

Variable Selection for Kernel Classification

Communications in Statistics-Simulation and Computation 2011; 40 : 229-246.

VAN HEERDEN A, LE ROUX NJ, SWART J, RYPSTRA T, GARDNER S, BOTHA A.

Chemical alterations induced by Pycnoporus sanguineus/Aspergillus flavipes co-cultures in wood from different tree species

Wood Science and Technology 2011; 45 : 237-248.

BURGER BV, VIVIERS MZ, LE ROUX NJ, MORRIS J, BEKKER JPI, LE ROUX M.

Olfactory cue mediated neonatal recognition in sheep

Ovis aries. Journal of Chemical Ecology 2011; 37 : 1150-1163.

STEEL SJ, UYS DW.

A variable selection proposal for multiple linear regression analysis

Journal of Statistical Computation and Simulation 2011; 81(12) : 2095-2105.

2010

GOEGEBEUR Y, BEIRLANT J, DE WET T.

Generalized kernel estimators for the Weibull-tail coefficient

Communications in Statistics-Theory and Methods 2010; 39 : 3695-3716.

GOEGEBEUR Y, BEIRLANT J, DE WET T.

Kernel estimators for the second order parameter in extreme value statistics

Journal of Statistical Planning and Inference 2010; 140 : 3695-3716.

DU PLESSIS M, LE ROUX NJ, GARDNER S, SWART JPJ, RYPSTRA T.

The pulp and paper properties of Sirex noctilio infested and fire damaged thermo-mechanically pulped, South African grown Pinus patula

Journal of Statistical Planning and Inference 2010; 72(3/4) : 173-179.

LOUW N, STEEL SJ, LAMONT MMC.

Identifying influencial cases in Kernel Fisher Discriminant Analysis by Using the Smallest Enclosing Hypersphere

32nd Annual Conference of the German Classification Society (Advances in data analysis, data handling and business intelligence), Helmut-Schmidt-University, Hamburg, Germany, Springer 2010: 363-371.

VAN DEVENTER PJU, MANNA Z G.

An easy and low cost option for economic statistical process control using Excel

ORION: Journal of the Operations Research Society of South Africa 2010; 25(1) : 1-15.

RAMJEE S, MCLEOD H.

Private Sector perspective on National Health Insurance

In South African Health Review HEALTH SYSTEMS TRUST, DURBAN, South Africa, 2010: 179-194.

VILJOEN H, NEL DG.

Common singular spectrum analysis of several time series

Journal of Statistical Planning and Inference 2010; 140 : 260-267.

OOSTHUIZEN S, STEEL SJ.

Variable Selection for Kernel Classifiers: A Feature-To-Input space approach

32nd Annual Conference of the German Classification Society (Advances in data analysis, data handling and business intelligence), Helmut-Schmidt-University, Hamburg, Germany, Springer 2010: 157-166.

UYS DW, STEEL SJ.

Using a Truncated Cp Statistic for Variable Selection in Multiple Linear Regression

Communications in Statistics-Simulation and Computation 2010; 39(2) : 420-432.

UYS DW, STEEL SJ.

The relationship between cross-sectional volatility, tracking-error and active positions: The case for South Africa

Corporate Ownership and Control 2010; 7(3) : 219-227.

2009

CONRADIE WJ, DE WET T, JANKOWITZ M.

Performance of nonlinear smoothers in signal recovery

Applied Stochastic Models in Business and Industry 2009; 25(4) : 425-444.

BIERMAN S, STEEL SJ.

Variable Selection for Support Vector Machines

Communications in Statistics-Simulation and Computation 2009; 38(8) : 1640-1658.

LA GRANGE AM, LE ROUX NJ, GARDNER S.

Biplot GUI: Interactive biplots in R.

Journal of Statistical Software 2009; 30(12) : 1-37.

GARDNER S, LE ROUX NJ, MAUNDERS H, SHAH V, PATHWARDHAN S.

Biplot methodology in exploratory analysis of microarray data

Statistical Analysis and Data Mining 2009; 2(2) : 135-145.

SCHEEPERS GC, LE ROUX NJ, GARDNER S, RYPSTRA T.

Discolouration during kiln drying of South African Pinus elliottii

Journal of the Institute of Wood Science 2009; 19(2) : 57-68.

2008

GOEGEBEUR Y, BEIRLANT J, DE WET T.

Linking Pareto-tail kernel goodness-of-fit statistics with tail index at optimal threshold and second order estimation

REVSTAT - Statistical Journal 2008; 6(1) : 51-69.

CLOVER R.

Taxation of life insurance in South Africa revisisted

South African Actuarial Journal 2008; 8 : 1-34.

DE WET T.

Kwadratiese vorme in stogastiese veranderlikes/ Quadratic forms in random variables

Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Technologie 2008; 27(3) : 5-22.

DU PLESSIS M, LE ROUX NJ, GARDNER S, SWART JPJ, RYPSTRA T.

The effect of Sirex noctilio infestation and fire damage on the chemical composition of South African-grown Pinus patula pulpwood

Southern Forests 2008; 70(3) : 215-220.

GARDNER S, LE ROUX NJ, GOWER JC.

Measures of fit in principal component and canonical variate analyses

Journal of Applied Statistics 2008; 35(9) : 947-965.

LOUW N, LAMONT MMC, STEEL SJ.

Identification of Influential Cases in Kernel Fisher Discriminant Analysis

Communications in Statistics-Simulation and Computation 2008; 37 : 2050-2062.

VAN HEERDEN A, LE ROUX NJ, SWART J, GARDNER S, BOTHA A.

Assessment of wood degradation by Pycnoporus sanguineus when co-cultured with selected fungi

World Journal of Microbiology & Biotechnology 2008; 24 : 2489-2497.

WALTERS IS, LE ROUX NJ.

Monitoring gender remuneration inequalities in academia using biplots

Orion: Operations Research in South Africa 2008; 24(1) : 49-73.

LOUW N, LAMONT MMC, STEEL SJ.

Identification of Influential Cases in Kernel Fisher Discriminant Analysis

Communications in Statistics-Simulation and Computation 2008; 37 : 2050-2062.

STEEL SJ.

Statistiese model seleksie/ Statistical Model Selection

Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Technologie 2008; 27(3) : 38-56.

2007

ARNOLD G, GOWER JC, GARDNER S, LE ROUX NJ.

Biplots of free-choice-profile data in Generalized Orthogonal Procrustes Analysis

Journal of the Royal Statistical Society Series C-Applied Statistics 2007; 56(4) : 445-458.

MOSTERT PJ, BEKKER A, ROUX JJJ.

Shrinkage estimation of the lifetime parameters in the Rayleigh model using an empirical Bayesian approach

International Journal of Statistics and Management Systems 2007; 1(1-2) : 142-158.

SLATTERY PG, KEMP HJ.

Options for the development of the education and professional qualification of South African actuaries

South African Actuarial Journal 2007; 7 : 1-47.

STEEL SJ, UYS DW.

Variable selection in multiple linear regression: The influence of individual cases

Orion: Operations Research in South Africa 2007; 23(2) : 123-136.

LOUW N, LAMMONT MMC, STEEL SJ.

Identification of Influential Cases in Kernel Fisher Discriminant Analysis

S.Co 2007 Fifth Conference, Venice, Italy, 2007: 296-301.

STEEL SJ, OOSTHUIZEN S.

Input Variable selection for support Vector Machines

S.Co 2007 Fifth Conference, Venice, Italy, 2007: 475-479.

STEEL SJ, UYS DW.

Variable selection in multiple linear regression: The influence of individual cases

Orion: Operations Research in South Africa 2007; 23(2) : 123-136.

GOVENDER P, KAMBARAN N, PATCHETT N, RUDDLE A, TORR G, VAN ZYL N.

Poverty and inequality in South Africa and the world

South African Actuarial Journal 2007; 7 : 117-160.

VILJOEN H, NEL DG.

Common Singular Specgtrum Analysis of Time Series: A new approach to investigate common structure of series

Lissabon, ISI 2007: 0.

2006

BEIRLANT J, DE WET T, GOEGEBEUR Y.

A goodness-of-fit statistic for Pareto-type behaviour

Journal of Computational and Applied Mathematics 2006; 186 : 99-116.

DU TOIT C, CONRADIE WJ.

A realised volatility measurement using quadratic variation and dealing with microstructure effects

Orion: Operations Research in South Africa 2006; 22(2) : 117-129.

GARDNER S, GOWER JC, LE ROUX NJ.

A synthesis of canonical variate analysis, generalised canonical correlation and Procrustes analysis

Computational Statistics & Data Analysis 2006; 50 : 107-134.

LE ROUX NJ, GARDNER S.

A biplot based approach to discriminant analysis with categorical variables in the presence of reversals

South African Statistical Journal 2006; 10(1) : 1-31.

LOUW N, STEEL SJ.

Variable selection in kernel Fisher discriminant analysis by means of recursive feature elimination

Computational Statistics & Data Analysi 2006; 51 : 2043-2055.

STEEL SJ, UYS DW.

Influential data cases when the Cp criterion is used for variable selection in multiple linear regression

Computational Statistics & Data Analysi 2006; 50 : 1840-1854.

2005

CONRADIE WJ, DE WET T, JANKOWITZ M.

An overview of LULU smoothers with Application to Financial Data

Journal for Studies in Economics and Econometrics 2005; 29(1) : 97-121.

GARDNER S, LE ROUX NJ, ALDRICH C.

Process data visualisation with biplots

Minerals Engineering 2005; 18 : 955-968.

GARDNER S, LE ROUX NJ, RYPSTRA T, SWART JPJ.

Extending a scatterplot for displaying group structure in multivariate data: A case study

GARDNER S, LE ROUX NJ, RYPSTRA T, SWART JPJ.

GARDNER S, LE ROUX NJ.

Extensions of Biplot Methodology to Discriminant Analysis

Journal of Classification 2005; 22 : 59-86

LE ROUX NJ, GARDNER S, ALDRICH C.

Biplot Analysis of Process Systems

Transactions of the South African Institute of Electrical Engineers/ Handelinge Van Die Suid-Afrikaanse Instituut Van Elektriese Ingenieurs 2005; 96(4) : 253-258.

LE ROUX NJ, GARDNER S.

Analysing your multivariate data as a pictorial: A case for Applying Biplot Methodology

International Statistical Review 2005; 73 : 365-387.

LE ROUX NJ, HAMMAN WD, DE VILLIERS JU, JOUBERT C.

The influence of the nature of an enterprise’s activities on earnings per share and cash flow per share as determinants of share prices

Journal for Studies in Economics and Econometrics 2005; 29(1) : 61-81.

LOUW N, STEEL SJ.

A Review of Kernel Fisher Discriminant analysis for statistical classification

South African Statistical Journal 2005; 39 : 1-21.

VAN VUUREN JO.

Simultaneous identification of influential subsets and variable selection using quantabilities

South African Statistical Journal 2005; 39(1) : 35-58.

WURZ SJD, VAN PEER P, LE ROUX NJ, GARDNER S, DEACON HJ.

Continental Patterns in Stone Tools: A Technological and Biplot-Based Comparison of Early Late Pleistocene Assemblages from Northern and Southern Africa

African Archaeological Review 2005; 22(1) : 1-24.

2004

ALDRICH C, GARDNER S, LE ROUX NJ.

Monitoring of metallurgical process plants by using biplots

Aiche Journal 2004; 50(9) : 2167-2186.

BEIRLANT J, DE WET T, GOEGEBEUR Y.

Nonparametric estimation of extreme conditional quantiles

Journal of Statistical Computation and Simulation, 74:8, 567-580, DOI: 10.1080/00949650310001623407.

BOTHMA A, BOTHA HL, LE ROUX NJ.

School results and access test results as indicators of first-year performance at university

Orion: Operations Research in South Africa 2004; 20(1) : 73-88.

DE JONGH PJ, DE WET T, VAN DEVENTER PJU.

Saddlepoint approximations for the distribution of regression quantiles

South African Statistical Journal 2004; 38(1) : 59-78.

DE WET T.

Statistical adjustment of tidal gauge data

South African Statistical Journal 2004; 38 : 79-91.

JOUBERT C, LE ROUX NJ, DE VILLIERS JU, HAMMAN WD.

Earnings per share and cash flow per share as determinants of share prices in different phases of the economic business cycle as measured by the bootstrap applied to Demsetz’s method

Journal for Studies in Economics and Econometrics 2004; 28(1) : 89-118.

KROON RS, OMLIN CW.

Getting to Grips with Support Vector Machines: Application

South African Statistical Journal 2004; 38 : 159-172.

LE ROUX NJ, BOTHMA A, BOTHA HL.

Statistical properties of indicators of first-year performance at university

Orion: Operations Research in South Africa 2004; 20(2) : 161-178

MOSTERT JH, MOSTERT FJ, STEEL SJ.

Belangrikheid van arbeidsverwante risikofaktore vir beleggingsbesluitneming insake die bate-allokasie van langtermynversekeraars

Tydskrif vir Geesteswetenskappe 2004; 44(1) : 62-71.

STEEL SJ, OOSTHUIZEN S, UYS DW.

A measure of post variable selection error in multiple linear regression, and its estimation

Journal of Statistical Computation and Simulation 2004; 74 : 123-133.

2003

DE JONGH PJ, DE WET T.

Small sample performance of extreme regression quantiles

South African Statistical Journal 2003; 37 : 79-104.

DE VILLIERS JU, HAMMAN WD, JOUBERT C, LE ROUX NJ.

Earnings per share and cash flow per share as determinants of share value: Tests of significance using the bootstrap with Demsetz’s method

Journal for Studies in Economics and Econometrics 2003; 27(1) : 95-125.

ERASMUS PD, LE ROUX NJ, GARDNER S, LAMBRECHTS IJ.

The evaluation of traditional and value-added measures of capital intensity

Bestuursdinamika: Kontemporêre Navorsing / Management Dynamics: Contemporary Research 2003; 12 : 12-23.

LE ROUX NJ, GARDNER S, OLIVIER P.

Biplots for displaying multidimensional financial performance data graphically

SA Journal of Accounting Research (Formerly: De Ratione) 2003; 17(1) : 41-64.

WURZ S, LE ROUX NJ, GARDNER S, DEACON HJ.

Discriminating between the end products of the earlier Middle Stone Age sub-stages at Klasies River using biplot methodology

Journal of Archaeological Science 2003; 30 : 1107-1126.

GARDNER S, LE ROUX NJ.

Discriminant analysis with categorical variables: a biplot based approach

26th Annual Conference of the Gesellschaft fur Klassifikation e.V. Universität Mannheim, Mannheim, Germany, 2003: 30-38.

GARDNER S, LE ROUX NJ.

Graphics and visualisation in practice: Biplots for exploring multidimensional reality

Bulletin of the International Statistical Institute, 54th proceedings, Berlin, Germany, 2003: 270-273.

STEEL SJ, LOUW N.

Between Data Science and Applied Data Analysis

26th Annual Conference of the Gesellschaft fur Klassifikation e.V. University of Mannheim, Mannheim, Germany, Springer 2003: 109-117.

2002

BLOOM JZ, LAMBRECHTS IJ, LE ROUX NJ.

The behaviour of financial ratios for capital and labour intensive enterprises during the economic cycle

Journal for Studies in Economics and Econometrics 2002; 26(1) : 51-70.

DE WET T, DE JONGH PJ, CLOETE GS.

Combining Vasicek and robust estimators for forecasting systematic risk

Investment Analysts Journal 2002; 55 : 37-44.

MOSTERT JH, STEEL SJ, MOSTERT FJ.

Importance of external environmental labour-related risk factors for financial investment decision making

Suid-Afrikaanse Tydskrif vir Ekonomiese en Bestuurswetenskappe/South African Journal of Economic and Management Sciences 2002; 5(3) : 644-662.

NEL M, NEL DG, JOUBERT G.

A comparison of approximate confidence interval methods for the difference between two independent binomial proportions

South African Statistical Journal 2002; 36(1) : 77-95.

VAN DER BERG S, WOOD LC, LE ROUX NJ.

Differentiation in black education

Development Southern Africa 2002; 19(2) : 289-306.

VAN DER MERWE L, MARITZ JS.

Estimating the Conditional False-Positive Rate for Semi-Latent Data

Epidemiology and Infection 2002; 13(4) : 424-430.

YADAVALLI VSS, MOSTERT PJ, BEKKER A, BOTHA M.

Berekening van ‘n posteriori-verdeling in Bayes-analise: Toepassing in ‘n betroubaarheidstelsel wat afwisselend gebruik word

Suid-Afrikaanse Tydskrif vir Natuurwetenskap en Tegnologie/South African Journal of Science and Technology 2002; 21(3) : 78-82.

2001

BURDEN M, GARDNER S, LE ROUX NJ & SWART JPJ.

Ou-Kaapse meubels en stinkhoutidentifikasie: Moontlikhede met kanoniese veranderlike-analise en bistippings

SA Tydskrif vir Kultuurgeskiedenis. 2001; Vol. 15(1), 50 – 73.

ERASMUS PD, LAMBRECHTS IJ, LE ROUX NJ & GARDNER S.

The use of biplots to interpret multivariate data: Measuring capital intensity

Management Dynamics: Contemporary research. 2001; Vol. 10(4), 48 – 73.

MOSTERT JH, STEEL SJ, MOSTERT FJ.

Portfolio management practices of investment practitioners active in the long-term insurance industry

South African Journal of Economic and Management Sciences 2001; 4(2):344-358.

STEEL SJ, LOUW N.

Variable selection in discriminant analysis: measuring the influence of individual cases

Computational Statistics and Data Analysis 2001; 37:249-260

VAN DER BERG S, WOOD LC & LE ROUX NJ.

Differentiation in black education

Development Southern Africa 2001; (In Press).

YADAVALLI, VSS, BEKKER A, MOSTERT PJ & BOTHA M.

Bayesian estimation of the stationary rate of disappointments for a model of a two-unit intermittently used system

Pakistan Journal of Statistics 2001; 17(2), 117-125.

YADAVALLI VSS, BEKKER A, MOSTERT PJ & BOTHA M.

Bayesian highest posterior density intervals for the availability of a system with ‘rest-period’ for the repair facility

South African Journal of Industrial Engineering 2001; 12(2), 17–24.

MOSTERT PJ, BEKKER A & ROUX JJJ.

A Bayesian method to analyse cancer survival times using the Weibull model

2001. The sixth world Meeting of the International Society for Bayesian Analysis. Proceedings of ISBA 2000 – Bayesian Methods with applications to Science, Policy and Official Statistics. Selected papers from ISBA 2000: 371-380.

MOSTERT PJ, BEKKER A, YADAVALLI VSS & BOTHA M.

The study of the posterior distribution of the stationary rate of disappointments for an intermittently used two-unit cold standby system

2001. Proceedings of the Xth International Symposium on Applied Stochastic Models and Data Analysis, Selected Papers from ASMDA, Volume 2, 767-772.

MOSTERT PJ, BEKKER A, YADAVALLI VSS & BOTHA M.

Variable selection in discriminant analysis in the presence of outliers

23rd International Conference on Information Technology Interfaces. Proceedings of the 23rd International Conference on Information Technology Interfaces. Pula, Croatia, June 2001. 251-256.

2000

DE WET, T.

2000 Invited discussion of “Contributions of empirical and quantile processes to the asymptotic theory of goodness-of-fit tests”

by del Barrio, E, Cuesta-Albertos JA and Matran, C (2000), TEST 9, 1-96.

BEKKER, A., ROUX, J.J.J and MOSTERT, P.J.

A generalization of the compound Rayleigh distribution: Using Bayesian methods on cancer survival times

Communications of Statistics – Theory and Methods 2000; 29(7), 1419-1433.

SALES, J, DEEMING, DC, VAN DEVENTER, PJU, MARTELLA, MB, NAVARRO, JL.

Diurnal time-activity budget of adult Greater Rheas (Rhea americana) in a farming environment

Arciv Für Geflügelkunde – European Poultry Science, Revue de science Avicole Européenne 2000; 64(5): 207-210.

STEEL, SJ, LOUW, N EN LE ROUX, NJ.

A comparison of the post selection error rate behaviour of the normal and quadratic linear discriminant rules.

Journal of Statistical Computation and Simulation 2000; 65, 157-172

VAN DER MERWE, L and LOMBARD, CJ.

Hierarchical Bayes Analysis of the Simplest Case-Crossover Design

Journal of Statistical Computation and Simulation 2000; 34 (2), 163-181.

VAN VUUREN, JO and CONRADIE, WJ.

Diagnostics and plots for identifying collinearity-influential observations and for classifying multivariate outliers

South African Statistical Journal 2000; 34(2), 135-161.