Magister Scientiae - MSc (Statistics and Population Studies)http://hdl.handle.net/11394/1582024-03-28T20:17:32Z2024-03-28T20:17:32ZPower studies of multivariate two-sample tests of comparisonSiluyele, Ian Johnhttp://hdl.handle.net/11394/106522024-02-20T00:02:04Z2007-01-01T00:00:00ZPower studies of multivariate two-sample tests of comparison
Siluyele, Ian John
The multivariate two-sample tests provide a means to test the match between two multivariate distributions. Although many tests exist in the literature, relatively little is known about the relative power of these procedures. The studies reported in the thesis contrasts the effectiveness, in terms of power, of seven such tests with a Monte Carlo study. The relative power of the tests was investigated against location, scale, and correlation alternatives. Samples were drawn from bivariate exponential, normal and uniform populations. Results from the power studies show that there is no single test which is the most powerful in all situations. The use of particular test statistics is recommended for specific alternatives. A possible supplementary non-parametric graphical procedure, such as the Depth-Depth plot, can be recommended for diagnosing possible differences between the multivariate samples, if the null hypothesis is rejected. As an example of the utility of the procedures for real data, the multivariate two-sample tests were applied to photometric data of twenty galactic globular clusters. The results from the analyses support the recommendations associĀated with specific test statistics.
>Magister Scientiae - MSc
2007-01-01T00:00:00ZFemale unemployment in South Africa: insight from the 2021 labour force survey.Mfubu, Anelehttp://hdl.handle.net/11394/105572023-11-15T00:03:14Z2023-01-01T00:00:00ZFemale unemployment in South Africa: insight from the 2021 labour force survey.
Mfubu, Anele
The study focused on female unemployment and aimed to establish whether or not there is a relationship between female unemployment and demographic characteristics, whether the currently unemployed have ever worked or not, their duration of unemployment and the reasons for not working. It utilized the existing dataset from Statistics South Africa's fourth-quarter of 2021 Labour Force Survey. The study suggested that there are differentials in female unemployment, according to demographic characteristics. More precisely the greatest share percentage of unemployed females in South Africa was found within 25-34 age group and who are single. Nonetheless, those within 15-24 most of them were found among those who have never worked before, while a high percentage share of those who have work experience was found in 55-64 age group.
>Magister Scientiae - MSc
2023-01-01T00:00:00ZAssessing the high-risk behaviour of first year students entering the University of the Western CapeAbels, Melissa Dionehttp://hdl.handle.net/11394/102932023-06-20T00:02:23Z2007-01-01T00:00:00ZAssessing the high-risk behaviour of first year students entering the University of the Western Cape
Abels, Melissa Dione
Globally, new HIV infections are heavily concentrated among the youth, i.e., persons aged 15-24 years old (UNAIDS, 2006b). In South Africa, the estimated national HIV prevalence was 10.4% among the youth in 2006 (Dorrington et a|.2006). The 2005-2006 national South African HIV rates ranged from 31.8o/oto39.3% among female youth and from 7.5oh to 10.1o/o among male youth (Dorrington et al. 2006; Pettifor et al. 2004; Shisana et al. 2005). UNAIDS (2006) stated that the future course of the HIV epidemic
hinges on the high-risk behaviours the youth adept or maintain. The motivation for the study is to assess the high-risk behaviours that contribute to the spread of HIV and AIDS among the youth. The most influential high-risk behaviours that contribute to the spread of HIV and AIDS are unprotected sexual intercourse and having more than one sexual partner (Nattrass, 2004, Pettifor et al. 2004; Shisana et al. 2005;
UYF & HSRC, 2005). Those who are in violent relationships, fear the threat of violence, which prevents them from insisting on condom use and this increases the risk of HIV infection (MacPhail & Campbell, 2001). Factors that leave the youth unable to set boundaries on when they want to have sex, what type of sex, or the use of contraception increase the risk of HIV infection. These factors include transactional sex, young age at first sex, cigarette smoking, alcohol use, drug use and suicidal behaviour (Aitken, 2005; Basile et al. 2006; Flisher et al. 1993c; Kauftnan & Stavrou, 2002; Pettifor et al. 2004; Shisana et aI.2005\. The population for this study included all full time first year students who registered at UWC for the first time in 2006 that attended the orientation week. A stratified, sequential random sample was drawn from the students attending the orientation. The Science Faculty Research Committee of UWC gave the consent to undertake the study. Informed
consent was obtained from the 796 respondents and anonymity of their participation was ensured. The measuring instrument was a self-administered questionnaire. SAS package (SAS Institute Inc. 2004-2005) was used to clean the data and to do the analyses. Frequencies and percentages were provided for nominal and medians were provided for ratio scales. Rao-Scott Chi-square test was used to test the bivariate analysis between the high-risk behaviours. Multivariate logistic regression models were used to provide a clearer perspective on the effects of high-risk behaviours on non-condom use at last sex
Doctor Educationis
2007-01-01T00:00:00ZA statistical investigation into the admissions criteria for the Electrical- and Mechanical Engineering courses at the Peninsula TechnikonBooysen, Desmond Reginaldhttp://hdl.handle.net/11394/97752023-03-25T00:02:28Z1995-01-01T00:00:00ZA statistical investigation into the admissions criteria for the Electrical- and Mechanical Engineering courses at the Peninsula Technikon
Booysen, Desmond Reginald
Concern was expressed by the School of Electrical- and Mechanical Engineering and Computer Data Processing (School of EMC) regarding the School's admissions criteria for the Electrical- and Mechanical Engineering courses. Admission to these courses was primarily based on candidates' matric performance. The results of an aptitude test were used as a secondary criterion in selecting "academically risk" students. This investigation focused mainly on the following issues: The use of cut-off points in matric results and an aptitude test as admissions criteria. Identification of Matric subjects and/or aptitude test components that might assist in the selection of potentially successful of candidates. This study reports on Chaid and discriminant analyses performed to identify the important predictors of successful study. From the results of these tests regression models were constructed that were used to determine expected pass rates in first semester subjects. The Swedish rating was the best predictor of successful first semester study. An admissions Swedish score of at least 35 is recommended.
The aptitude test total was found to be not significant in identifying potentially successful candidates. However, individual aptitude test components were significant in describing performance in specific first semester subjects.
Magister Commercii - MCom
1995-01-01T00:00:00Z