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

      Du Toit, C.; Conradie, W. J. (Operations Research Society of South Africa, 2006)
      ENGLISH SUMMARY : A volatility measurement that overcomes the respective problems encountered when implementing the realised and Discrete Sine Transform volatility measurements is defined and discussed in this paper. First ...
    • Recommender systems 

      Dumbleton, Bronwyn Catherine (Stellenbosch : Stellenbosch University, 2019-12)
      ENGLISH ABSTRACT: A Recommender System (RS) is a particular type of information filtering system used to propose relevant items to users. Their successful application in online retail is reflected in increased customer ...
    • Regularised Gaussian belief propagation 

      Kamper, Francois (Stellenbosch : Stellenbosch University, 2018-12)
      ENGLISH SUMMARY : Belief propagation (BP) has been applied as an approximation tool in a variety of inference problems. BP does not necessarily converge in loopy graphs and, even if it does, is not guaranteed to provide ...
    • A report on the development of the control chart 

      Contardo, Ivona (Stellenbosch : Stellenbosch University, 2007-03)
      ENGLISH ABSTRACT: The goal of quality control as stated by Feigenbaum (1961) is to provide a product or service into which quality Is designed, built, marketed and maintained at the lowest economical cost which simultaneously ...
    • Risk and admissibility for a Weibull class of distributions 

      Negash, Efrem Ocubamicael (Stellenbosch : Stellenbosch University, 2004-12)
      ENGLISH ABSTRACT: The Bayesian approach to decision-making is considered in this thesis for reliability/survival models pertaining to a Weibull class of distributions. A generalised right censored sampling scheme has ...
    • The saddle-point method and its application to the hill estimator 

      Buitendag, Sven (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH SUMMARY : The saddle-point approximation is a highly accurate approximation of the distribution of a random variable. It was originally derived as an approximation in situations where a parameter takes on large ...
    • School results and access test results as indicators of first-year performance at university 

      Bothma, A.; Botha, H. L.; Le Roux, N. J. (Operations Research Society of South Africa, 2004)
      ENGLISH SUMMARY : The goals set by the National Plan for Higher Education, the fact that many schools are still severely disadvantaged as well as far-reaching changes in the school system demand that South African universities ...
    • Short-term wind speed prediction using various forecasting methods 

      Nambandi, Maria Ndinelago (Stellenbosch : Stellenbosch University, 2020-03)
      ENGLISH SUMMARY : There is a significant challenge in finding ways to enhance energy security and decrease greenhouse gas emissions emanating from the consumption of non-renewable resources for energy. The release of ...
    • Shorter telomere length : a potential susceptibility factor for HIV-associated neurocognitive impairments in South African woman 

      Malan-Muller, Stefanie; Hemmings, Sian M. J.; Spies, Georgina; Kidd, Martin; Fennema-Notestine, Christine; Seedat, Soraya (PLoS, 2013-03)
      The neuropathogenesis of the human immunodeficiency virus (HIV) may manifest as various neurocognitive impairments (NCI). HIV-positive individuals also have significantly shorter telomere length (TL) in peripheral blood ...
    • Simulation of a coal stacking process using an online X-Ray Fluorescence analyser 

      Rossouw, R. F.; Coetzer, R. L. J.; Le Roux, N. J. (Operations Research Society of South Africa (ORSSA), 2018)
      The Sasol Coal Value Chain is a complex system consisting of blending, stacking and reclaiming of no fewer than six different coal sources with vastly different coal qualities. The amount and quality of the gas produced ...
    • Some statistical aspects of LULU smoothers 

      Jankowitz, Maria Dorothea (Stellenbosch : University of Stellenbosch, 2007-12)
      The smoothing of time series plays a very important role in various practical applications. Estimating the signal and removing the noise is the main goal of smoothing. Traditionally linear smoothers were used, but nonlinear ...
    • Sorting in combination with quality scoring : a tool for industry professionals to identify drivers of wine quality rapidly 

      Brand, J.; Kidd, M.; Van Antwerpen, L.; Valentin, D.; Naes, T.; Nieuwoudt, Helene (South African Society for Enology and Viticulture, 2018)
      Quality plays an important role in the criteria directing wine product development. The evaluation of sensory characteristics associated with wine quality, as perceived by industry professionals, is therefore important. ...
    • The sources of South African equity fund performance 

      Lester, N.; Corubolo, D. (Portfolio management -- South Africa, 2015-11)
      ENGLISH SUMMARY : This paper aims to quantify some of the sources of South African equity fund performance. In particular, it aims to provide insights into the relative importance of sector allocation and stock selection ...
    • South African security market imperfections 

      Jooste, Dirk (Stellenbosch : University of Stellenbosch, 2006-03)
      In recent times many theories have surfaced posing challenging threats to the Efficient Market Hypothesis. We are entering an exciting era of financial economics fueled by the urge to have a better understanding of the ...
    • A statistical analysis of student performance for the 2000-2013 period at the Copperbelt University in Zambia 

      Ngoy, Mwanabute (Stellenbosch : Stellenbosch University, 2017-12)
      ENGLISH SUMMARY : Education in general, and tertiary education in particular are the engines for sustained development of a nation. In this line, the Copperbelt University (CBU) plays a vital role in delivering the ...
    • A statistical analysis of the renumeration of teaching/research staff at Stellenbosch University for the years 2002 to 2005 

      Walters, Idielletta Sophia (Stellenbosch : Stellenbosch University, 2007-03)
      ENGLISH ABSTRACT: This assignment investigates the gender and faculty remuneration gap of permanent full-time teaching/research staff members at Stellenbosch University. A dataset providing detailed information on ...
    • Statistical classification in high-dimensional scenarios with a focus on microarray data sets 

      Rodseth, Tessa Louise (2017-12)
      ENGLISH SUMMARY : High-dimensional data analysis characterises many contemporary problems in statistics and arise in many application areas. This thesis focuses on very high-dimensional problems in which the input predictor ...
    • Statistical classification procedures for analyisng functional data 

      Orsmond, Chane (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH SUMMARY : Functional data are obtained through the measurement of one or more variables at a set of discrete evaluation points over a continuum such as time, wavelength or values of a spatial variable. Functional ...
    • Statistical inference for inequality measures based on semi-parametric estimators 

      Kpanzou, Tchilabalo Abozou (Stellenbosch : Stellenbosch University, 2011-12)
      ENGLISH ABSTRACT: Measures of inequality, also used as measures of concentration or diversity, are very popular in economics and especially in measuring the inequality in income or wealth within a population and ...
    • Statistical inference of the multiple regression analysis of complex survey data 

      Luus, Retha (Stellenbosch : Stellenbosch University, 2016-12)
      ENGLISH SUMMARY : The quality of the inferences and results put forward from any statistical analysis is directly dependent on the correct method used at the analysis stage. Most survey data analyzed in practice riginate ...