Browsing Theses and Dissertations (Statistics) by Issue Date

Browsing Theses and Dissertations (Statistics) by Issue Date

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  • Potgieter, Ryno (University of Pretoria, 2013)
    Determining the correct sample size is of utmost importance in study design. Large samples yield classifiers or parameters with more precision and conversely, samples that are too small yield unreliable results. Fixed ...
  • Graham, Marien Alet (University of Pretoria, 2013)
    Distribution-free (nonparametric) control charts can be useful to the quality practitioner when the underlying distribution is not known. The term nonparametric is not intended to imply that there are no parameters ...
  • Storm, Christine (University of Pretoria, 2013-05-29)
    Parametric methods are effective and appropriate when data sets are obtained by well-defined random sampling procedures, the population distribution for responses is well-defined, the null sampling distributions of suitable ...
  • Botes, Michelle (University of Pretoria, 2014)
    An occurrence which is sometimes observed in a model based on dichotomous dependent variables is separation in the data. Separation in the data is when one or more of the independent variables can perfectly predict some ...
  • Sepato, Sandra Moepeng (University of Pretoria, 2014)
    The most common analysis used for binary data is generalised linear model (GLM) with either a binomial or bernoulli distribution using either a logit, probit, complementary log-log or other type of link functions. However, ...
  • Van Staden, Paul Jacobus (University of Pretoria, 2014)
    This thesis develops a methodology for the construction of generalized families of probability distributions in the quantile statistical universe, that is, distributions specified in terms of their quantile functions. ...
  • Adamski, Karien (University of Pretoria, 2014)
    This study focuses on the development of a generalised multivariate beta type II distribution as well as the noncentral and bimatrix counterparts with positive domain. These models emanate from a sequential quality ...
  • Steenkamp, Jan Hendrik Harm (University of Pretoria, 2014)
    A general insurance risk model consists of in initial reserve, the premiums collected, the return on investment of these premiums, the claims frequency and the claims sizes. Except for the initial reserve, these components ...
  • Mazarura, Jocelyn Rangarirai (University of Pretoria, 2015)
    Over the past few years, our increased ability to store large amounts of data, coupled with the increasing accessibility of the internet, has created massive stores of digital information. Consequently, it has become ...
  • van Niekerk, Johan Magnus (University of Pretoria, 2015)
    A combination of image processing algorithms can be used to detect and extract certain objects from images. Image noise may obscure the objects in the images and must rst be removed using image denoising and smoothing ...
  • Letsoalo,Phineas Masete (University of Pretoria, 2016)
    Measures of poverty are usually estimated using data from national household surveys. The sample design of official household surveys is typically complex, involving multi-stage stratified cluster sampling. Complex sampling ...
  • Makhanya, Nhlanhla Well-Beloved (University of Pretoria, 2016)
    The aim of the study was to survey permutation tests, bootstrapping and jackknife methods and their application to significance testing of regression coefficients in linear regression analysis. A Monte Carlo simulation ...
  • Celliers, Rauldo Eybers (University of Pretoria, 2016)
    Runs-type signalling rules and sensitizing rules (Page (1955)) were originally introduced to detect non-random patterns in the process being monitored (Montgomery (2013)). Further development led to runs-type signalling ...
  • Hendriks, Johannes Jurgens (University of Pretoria, 2017)
    No abstract
  • Lau, Kwok-Ho (University of Pretoria, 2017)
    In the process of data acquisition the information obtained are more than often contaminated by noise. To purify the data smoothers are designed to remove the noise. The LULU operators are such smoothers, more speci cally, ...
  • Oppel, Anel (University of Pretoria, 2017)
    The event of a default for low-default portfolios, such as sovereign debt or banks, have received much attention as a result of the increasing instabilities in financial markets. The lack of sufficient default information ...
  • Loots, Mattheus Theodor (University of Pretoria, 2017)
    Advances in computing has undoubtfully been one of the main catalysts in the formation of the discipline always known as Statistics. A fundamental question addressed here is whether computing facilities, such as parallel ...
  • Janse van Rensburg, Charl (University of Pretoria, 2017)
    In recent times Big Data has been talked about in many areas, ranging from information technology, to government and healthcare, and to business. Big Data is changing the world we live in in many respects, especially as ...
  • Delport, Marion (University of Pretoria, 2018)
    In this study the nite mixture of multivariate Gaussian distributions is discussed in detail including the derivation of maximum likelihood estimators, a discussion on identi ability of mixture components as well as a ...
  • Kraamwinkel, Christine (University of Pretoria, 2018)
    In this mini-dissertation we briefly describe the context and development of spatial statistics, spatial sampling and point patterns. Thereafter spatial homogeneity is considered in detail. Before selecting an appropriate ...