Browsing Research Articles (Statistics and Actuarial Science) by Title
Now showing items 21-33 of 33
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Optimizing 16S rRNA gene profile analysis from low biomass nasopharyngeal and induced sputum specimens
(BMC (part of Springer Nature), 2020-05-12)Background: Careful consideration of experimental artefacts is required in order to successfully apply highthroughput 16S ribosomal ribonucleic acid (rRNA) gene sequencing technology. Here we introduce experimental design, ... -
Plasma sarcosine does not distinguish early and advanced stages of prostate cancer
(Health and Medical Publishing Group (HMPG), 2012-08)Introduction. Diagnosis of prostate cancer by prostate specific antigen (PSA) is error-prone and cannot distinguish benign prostatic hyperplasia (BPH) from malignant disease, nor identify aggressive and indolent types. ... -
Precision, consistency and bias in emerging equity markets
(International Foundation for Research & Development, 2014-05)The use of multiples is a popular approach employed by analysts to perform valuations. These multiples are based on optimal value drivers, the valuation performance of which should be underpinned by empirical findings from ... -
Quantification of estimation instability and its application to threshold selection in extremes
(South African Statistical Association, 2015-03) -
A realised volatility measurement using quadratic variation and dealing with microstructure effects
(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 ... -
School results and access test results as indicators of first-year performance at university
(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 ... -
Shorter telomere length : a potential susceptibility factor for HIV-associated neurocognitive impairments in South African woman
(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
(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 ... -
Sorting in combination with quality scoring : a tool for industry professionals to identify drivers of wine quality rapidly
(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. ... -
Statistical properties of indicators of first-year performance at university
(Operations Research Society of South Africa, 2004)ENGLISH SUMMARY : Appraisal of admission procedures is a matter of urgency for South African universities, as well as for schools producing the prospective students. In this article the focus is on how various statistical ... -
Steady growth in antiretroviral treatment provision by disease management and community treatment programmes
(Health & Medical Publishing Group, 2007-05)[No abstract available] -
Value at risk and extreme value theory : application to the Johannesburg Securities Exchange
(Bureau for Economic Research, 2018)Value at Risk (VaR) has been established as one of the most important and commonly used financial risk management tools. Nevertheless, the attractive features and wide-spread use of VaR could not help to avoid a number of ... -
Variable selection in multiple linear regression : the influence of individual cases
(Operations Research Society of South Africa, 2007)ENGLISH SUMMARY : The influence of individual cases in a data set is studied when variable selection is applied in multiple linear regression. Two different influence measures, based on the Cp criterion and Akaike’s ...
