Recent accredited publications of the department are listed here, updated annually. Authors who were UFS staff at time of writing are marked with an asterisk.

2018

  • Hierarchical forecasting of tourist arrivals at the Victoria Falls Rainforest, Zimbabwe. By T Makoni and D Chikobvu*.
  • Optimal mission abort policy with multiple shock number thresholds. By G Levitin and M Finkelstein*.
  • Using shrinkage estimators to reduce bias and MSE in estimation of heavy tails. By J Beirlant*, G Maribe, A Verster*.
  • How publication guidelines for clinical pharmacology trials may help to accelerate knowledge transfer. By A Ring* and K Breithaupt-Grögler.
  • Teaching statistics for Master Students in Africa - background and experiences. By A Ring*.
  • Equivalence Tests in Subgroup Analyses. By A Ring*, M Scharpenberg, S Grill, R Schall*, and W Brannath.
  • Modelling and Forecasting Zimbabwe's Tourist Arrivals Using Time Series Method: A Case Study of Victoria Falls Rainforest. By T Makoni, and D Chikobvu*.
  • A Markov Model to Estimate Mortality Due to HIV/AIDS Using Viral Load Levels-Based States and CD4 Cell Counts: A Principal Component Analysis Approach. By C Shoko, D Chikobvu*, and P Bessong.
  • A Markov model to estimate mortality due to HIV/AIDS using CD4 cell counts based states and viral load: a principal component analysis approach. By D Chikobvu*, and C Shoko.
  • On optimal operational sequence of components in a warm standby system. By M Finkelstein*, N Hazra*, and J Cha.
  • On stochastic comparisons of finite mixtures for some semiparametric families of distributions. By N Hazra* and M Finkelstein*.
  • Time-homogeneous Markov process for HIV/AIDS progression under a combination treatment therapy: cohort study, South Africa. By C Shoko, and D Chikobvu*.
  • Determinants of viral load rebound on HIV/AIDS patients receiving antiretroviral therapy: results from South Africa. By C Shoko, and D Chikobvu*.
  • Modelling tourism demand volatility using a seasonal autoregressive intergrated moving average autoregressive conditional heteroscedasticity model for Victoria Falls Rainforest arrivals in Zimbabwe. By T Makoni, and D Chikobvu*.
  • Penalized bias reduction in extreme value estimation for censored Pareto-type data, and long-tailed insurance applications. By J Beirlant*, G Maribe, and A Verster*.
  • A Markov model to estimate mortality due to HIV/AIDS using CD4 cell counts based states and viral load: a principal component analysis approach. By D Chikobvu*, and C Shoko.
  • An optimal replacement of systems with failure rates described by a random jump process. By J Cha, M Finkelstein*, and G Levitin.
  • Bivariate preventive maintenance of systems with lifetimes dependent on a random shock process. By J Cha, M Finkelstein*, and G Levitin.
  • Heterogeneous standby systems with shocks-driven preventive replacements. By G Levitin, M Finkelstein*, and Y Dai.
  • Mission abort policy balancing the uncompleted mission penalty and system loss risk. By G Levitin, M Finkelstein*, and Y Dai.
  • On a New Shot Noise Process and the Induced Survival Model. By J Cha, and M Finkelstein*.
  • On information-based residual lifetime in survival models with delayed failures. By J Cha, and M Finkelstein*.
  • On preventive maintenance under different assumptions on the failure/repair processes. By J Cha, and M Finkelstein*.
  • On stochastic comparisons of minimum order statistics from the location-scale family of distributions. N Hazra*, M Kuiti, M Finkelstein*, and A Nanda.
  • On stochastic comparisons for population age and remaining lifetime. By J Cha, and M Finkelstein*.
  • Optimal mission abort policy for partially repairable heterogeneous systems. By J Cha, M Finkelstein* and G Levitin.
  • Optimal Mission Abort Policy for Systems Operating in a Random Environment. By G Levitin, and M Finkelstein*.
  • Optimal mission abort policy for systems in a random environment with variable shock rate. By G Levitin, and M Finkelstein*.
  • Optimal Mission Duration for Partially Repairable Systems Operation in a Random Environment. By M Finkelstein* and G Levitin.
  • Optimal mission duration for systems subject to shocks and internal failures. By M Finkelstein* and G Levitin.
  • Optimizing availability of heterogeneous standby systems exposed to shocks. By G Levitin, M Finkelstein*, and Y Dai.
  • Stochastic ordering for populations of manufactured items. By N Hazra*, M Finkelstein*, and J Cha.
  • Point Processes for Reliability Analysis: Shocks and Repairable Systems. By J Cha and M Finkelstein*.
  • Robust fit of Bayesian mixed effects regression models with application to colony forming unit count in tuberculosis research. D Burger, and R Schall*.
  • Robust Bayesian nonlinear mixed-effects modeling of time to positivity in tuberculosis trials. D Burger, R Schall*, and D Chen.
  • A Bayesian approach to inference on the variance of lognormal data. By J Harvey, and A van der Merwe.

2017

  • Penalized bias reduction in extreme value estimation for censored Pareto-type data, and long-tailed insurance applications. By J Beirlant*, G Maribe, and A Verster*.
  • Estimation of extreme inter-day changes to peak electricity demand using Markov chain analysis: A comparative analysis with extreme value theory. By C Sigauke, and D Chikobvu*.
  • Comparisons of performance indicators between Super Rugby and Currie Cup competition during 2014 Season. By R Schoeman, D Coetzee, and R Schall*.
  • Vulnerability mapping as a tool to manage the environmental impacts of oil and gas extraction. By S Esterhuyse, F Sokolic, N Redelinghuys, M Avenant, A Kijko, J Glazewski, L Plit, M Kemp, A Smit, AT Vos, MJ von Maltitz*.
  • Modelling censored losses using splicing: a global fit strategy with mixed Erlang and extreme value distributions. By T Reynkens, R Verbelen, J Beirlant*, and K Antonio.
  • Fitting tails affected by truncation. By J Beirlant*, IF Alves, T Reynkens.
  • A non-linear mixed model approach for excess of loss benchmark rating. By R Verlaak, and J Beirlant*.
  • Bivariate preventive maintenance for repairable systems subject to random shocks. JH Cha, M Finkelstein*, and G Levitin.
  • Value-at-Risk estimation of gold market with Stable and Generalised Hyperbolic Distributions. By K Chinhamu, and D Chikobvu*.
  • Optimal portfolio selection with stochastic maximum downside risk and uncertain implicit transaction costs. By S Muchori, and D Chikobvu*.
  • On stochastic comparisons for load-sharing series and parallel systems. By M Finkelstein*, and NK Hazra*.
  • The performance of univariate goodness-of-fit tests for normality based on the empirical characteristic function in large samples. By JM van Zyl*.
  • Modelling international tourist arrivals and volatility to the Victoria Falls Rainforest, Zimbabwe: Application of the GARCH family of models. By M Tendai, and D Chikobvu*.
  • Exact expressions for the weights used in least-squares regression estimation for the log-logistic and Weibull distribution. By JM van Zyl*.
  • A Bayesian control chart for a common coefficient of variation. By R van Zyl, and AJ van der Merwe*.
  • Bayesian control charts for tolerance limits in the case of normal populations. By R van Zyl, and AJ van der Merwe*.
  • Redundancy optimization for series-parallel phased mission systems exposed to random shocks. By G Levitin, M Finkelstein*, and Y Dai.
  • Preventive maintenance for systems with reparable minor failures. By M Finkelstein*, and M Shafiee.
  • Optimal Mission Duration for Partially Repairable Systems Operating in a Random Environment. By M Finkelstein*, and G Levitin.
  • Optimal backup in heterogeneous standby systems exposed to shocks. By G Levitin, and M Finkelstein*.
  • On stochastic comparisons of maximum order statistics from the location-scale family of distributions. By NK Hazra*, MR Kuiti, M Finkelstein*, AK Nanda.
  • On preventive maintenance of systems with lifetimes dependent on a random shock process. By JH Cha, M Finkelstein*, and G Levitin.
  • On optimal grouping and stochastic comparisons for heterogeneous items. By NK Hazra*, M Finkelstein*, and JH Cha.
  • On a single discrete scale for preventive maintenance with two shock processes affecting a complex system. By M Finkelstein*, I Gertsbakh, and R Vaisman.
  • Effect of element separation in series-parallel systems exposed to random shocks. By G Levitin, and M Finkelstein*.
  • A new stress-strength model for systems subject to stochastic shocks. By G Levitin, and M Finkelstein*.
  • Investigating the Performance of a Variation of Multiple Correspondence Analysis for Multiple Imputation in Categorical Data Sets. By J Nienkemper-Swanepoel, and MJ von Maltitz*.
  • Generalising Ward's Method for Use with Manhattan Distances. T Strauss, and MJ von Maltitz*.
  • Quantifying South Africa's sulphur dioxide emission efficiency in coal-powered electricity generation by fitting the three-parameter log-logistic distribution. By ME Girmay*, and D Chikobvu*.
  • Evaluating risk in precious metal prices with Generalised Lambda, Generalised Pareto and Generalised Extreme Value distributions. By K Chinhamu, C Huang, and D Chikobvu*.
  • Chemotherapy in the Elderly with Non-Small Cell Lung Cancer: A Non-Interventional, Prospective, Multicentric Observational Study. By  DF Heigener, G Hoeffken, D Wuerflein, M Feurer, A Rittmeyer, RM Huber, M Pietsch, A Ring*, K Deppermann.
  • Statistical reporting of clinical pharmacology research. By A Ring*, R Schall*, YK Loke, S Day.
  • Anolyte as an alternative bleach for stained cotton fabrics. By K Seiphetlheng, HJH Steyn, and R Schall*.
  • Morphological and skill-related fitness components as potential predictors of injuries in elite female field hockey players. By M Naicker, D Coetzee, and R Schall*.
  • Time-motion analysis of simulated elite Karate kumite matches. By E Le Roux, FF Coetzee, CJ van Rensburg, and R Schall*.
  • Analysis of Super Rugby from 2011 to 2015. By R Schoeman, D Coetzee, and R Schall*.
  • Precipitation intensity-duration-frequency curves and their uncertainties for Ghaap plateau. By CM Tfwala, LD van Rensburg, R Schall*, SM Mosia, and P Dlamini.
  • Age of diagnosis, incidence and prevalence of recurrent respiratory papillomatosis - A South African perspective. By RY Seedat, and R Schall*.

2016

  • Effect of uncertainty in total parasite infestation on accuracy and precision of estimates of ectoparasiticide efficacy. By R Schall*, DA Burger*, and TP Erasmus.
  • Classical optimal replacement strategies revisited. By M Finkelstein*, M Shafiee, and AN Kotchap*.
  • Justifying the Gompertz curve of mortality via the generalised Polya process of shocks. By JH Cha, and M Finkelstein*.
  • New shock models based on the generalised Polya process. By JH Cha, and M Finkelstein*.
  • On information-based warranty policy for repairable products from heterogeneous population. By H Lee, JH Cha, and M Finkelstein*.
  • On preventive maintenance of systems subject to shocks. By M Finkelstein*, and I Gertsbakh.
  • On some mortality rate processes and mortality deceleration with age. By JH Cha, and M Finkelstein*.
  • On some properties of shock processes in a 'natural' scale. By JH Cha, and M Finkelstein*.
  • Optimal long-run imperfect maintenance with asymptotic virtual age. By JH Cha, and M Finkelstein*.
  • Preventive maintenance of multistate systems subject to shocks. By M Finkelstein*, and I Gertsbakh.
  • Phase I and Phase II - control charts for the variance and generalised variance. By R van Zyl, and AJ van der Merwe*.
  • Estimation under the matrix variate elliptical model. By J van Niekerk, A Bekker, M Arashi, and DJ de Waal*.
  • Regression with an infinite number of observations applied to estimating the parameters of the stable distribution using the empirical characteristic function. By JM van Zyl*.
  • Accuracy and precision of alternative estimators of ectoparasiticide efficacy. By R Schall*, DA Burger*, and HG Luus.
  • Evidence for change: the affective impact of computer-assisted teaching and learning in statistics. By L van der Merwe*, and R Schall*.
  • Bias reduced tail estimation for censored Pareto type distributions. By J Beirlant*, A Bardoutsos, T de Wet, and I Gijbels.
  • Cluster randomised trial of a tailored intervention to improve the management of overweight and obesity in primary care in England. By J Goodfellow, S Agarwal, F Harrad, D Shepherd, T Morris, A Ring*, N Walker, S Rogers, and R Baker.
  • Limited role of culture conversion for decision-making in individual patient care and for advancing novel regimens to confirmatory clinical trials. By PPJ Phillips, CM Mendel, DA Burger*, A Crook, AJ Nunn, R Dawson, AH Diacon, and SH Gillespie.
  • Reliability study of a coherent system with single general standby component. By P Kundu, NK Hazra*, and AK Nanda.
  • Some results on majorisation and their applications. By A Kundu, S Chowdhury, AK Nanda, and NK Hazra*.
  • Stochastic mean absolute deviation model with random transaction costs: securities from the Johannesburg stock market. By S Mushori, and D Chikobvu*.
  • A Multivariate Gamma Distribution applied to compositional data analysis. By DJ de Waal*, R Coetzer*, and S van der Merwe*.
  • On stochastic comparisons for population age and remaining lifetime. By JH Cha, and M Finkelstein*.
  • Tail fitting for truncated and non-truncated Pareto-type distributions. J Beirlant*, IF Alves, and I Gomes.
  • Bayesian process control for the Phase II Shewart-type p-chart. By L Raubenheimer, and AJ van der Merwe*.
  • Mean-of-order p reduced-bias extreme value index estimation under a third-order framework. By F Caeiro, MI Gomes, J Beirlant*, and T de Wet.
  • A world-wide survey and field study in clinical haemostasis laboratories to evaluate FVIII:C activity assay variability of ADYNOVATE and OBIZUR in comparison with ADVATE. By PL Turecek, S Romeder-Finger, C Apostol, A Bauer, A Crocker-Buqué, DA Burger*, R Schall*, and H Gritsch.
  • On ageing concepts for repairable items from heterogeneous populations. By JH Cha, and M Finkelstein*.
  • Rainfall prediction for sustainable economic growth. By R Chifurira, D Chikobvu*, and D Dubihlela.
  • Tail fitting for truncated and non-truncated Pareto-type distributions. J Beirlant*, IF Alves, and I Gomes.
  • On stochastic comparisons for population age and remaining lifetime. By JH Cha, and M Finkelstein*.

FACULTY CONTACT

Please contact us by email for assistance.
We are currently not in our offices, as per the lockdown measures in place for South Africa.


Faculty Manager: Velaphi Makgwahla

T: + 27 51 401 3199
E: makgwahlamvt@ufs.ac.za

Marketing Manager: Elfrieda Lötter
T: +27 51 401 2531
E: lottere@ufs.ac.za

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