scholarly journals The predictive validity of the selection battery used for junior leader training within the South African national defence force

2003 ◽  
Vol 29 (3) ◽  
Author(s):  
Johannes Muller ◽  
Johann Schepers
Keyword(s):  
South African ◽  
Predictive Validity ◽  
Mental Stress ◽  
Test Results ◽  
The South ◽  
Independent Variables ◽  
Dependent Variables ◽  
Leader Training ◽  
National Defence ◽  
Selection Of

The principal objective of the study was to determine the predictive validity of the test battery used for the selection of junior leaders in the South African National Defence Force. A sample of 96 respondents completed certain indices of the SPEEX-Battery as well as the Advanced Ravens Progressive Matrices test. The test results were compared with the course results. Using canonical correlation analysis, a highly significant relationship was found between the independent variables and the dependent variables (r = 0,787; p is less than 0,00005). The predictors with the highest loadings were cognitive ability, conceptualisation, reading comprehension, listening potential, physical stress, and mental stress. Opsomming Die hoofdoelwit van die studie was om die voorspellingsgeldigheid van die toetsbattery vir keuring van junior leiers in die Suid Afrikaanse Nasionale Weermag te evalueer. ’n Steekproef van 96 respondente het sekere indekse van die SPEEX-Battery asook die Advanced Ravens Progressive Matrices toets voltooi. Die toetsresultate is vervolgens vergelyk met die kursusuitslae. Die veranderlikes is aan kanoniese korrelasie-ontleding onderwerp wat ’n betekenisvolle verwantskap opgelewer het tussen die onafhanklike veranderlikes en die afhanklike veranderlikes (r = 0,787; p is kleiner as 0,00005). Die voorspellers met die hoogste ladings was kognitiewe vermoë, konseptualisering, leesbegrip, luisterpotensiaal, fisieke stres en psigiese stres.

Adult ADHD in the South African workplace: the usefulness of a self-report screening measure and preliminary prevalence estimates

2019 ◽  
Vol 50 (2) ◽  
pp. 262-273
Author(s):  
Charles H Van Wijk
Keyword(s):  
At Risk ◽  
South African ◽  
Predictive Validity ◽  
Attention Deficit ◽  
Adult Adhd ◽  
Self Report ◽  
The South ◽  
Dsm 5 ◽  
Prevalence Estimates ◽  
Interpretation Systems

In the South African context, resource constraints often preclude the comprehensive assessment of large numbers of people for the likelihood of Adult Attention-Deficit/Hyperactivity Disorder (ADHD). Primary screening through a self-report measure may be useful to stream at-risk individuals towards diagnostic assessment services, as well as being useful in population and workplace based research. The present study set out, first, to investigate the usefulness of a self-report ADHD scale to identify at-risk individuals, and, second, to provide preliminary prevalence estimates for Adult ADHD, guided by Diagnostic and Statistical Manual of Mental Disorders (5th ed.; DSM-5) criteria, in a South African workplace sample. Workers in full-time skilled employment ( N = 1,917), aged 18–44, completed a self-report Adult ADHD scale, and participated in an interview with a psychologist. Their scale data, using three different scoring and interpretation systems, were subjected to statistical analysis. Favourable internal reliability and positive predictive validity were found. Different interpretation systems provided different prevalence estimations: using DSM-5 criteria, a total prevalence estimate of 3.3 % was calculated (attention deficit subtype = 0.9%, hyperactivity-impulsivity subtype = 1.0%, and combined subtype = 1.4%). The positive predictive validity found with this sample suggests that this scale can be used constructively in research or screening contexts to identify at-risk individuals. Furthermore, preliminary prevalence estimates for Adult ADHD, guided by DSM-5 criteria, are now available for a South African workplace sample.

scholarly journals Investigating the treatment of missing data in an Olympiad-type test – the case of the selection validity in the South African Mathematics Olympiad

Pythagoras ◽  
2016 ◽  
Vol 37 (1) ◽  
Author(s):  
Caroline Long ◽  
Johann Engelbrecht ◽  
Vanessa Scherman ◽  
Tim Dunne
Keyword(s):  
Missing Data ◽  
South African ◽  
Rasch Model ◽  
The South ◽  
Type Test ◽  
The Rasch Model ◽  
Final Round ◽  
Selection Of

The purpose of the South African Mathematics Olympiad is to generate interest in mathematics and to identify the most talented mathematical minds. Our focus is on how the handling of missing data affects the selection of the ‘best’ contestants. Two approaches handling missing data, applying the Rasch model, are described. The issue of guessing is investigated through a tailored analysis. We present two microanalyses to illustate how missing data may impact selection; the first investigates groups of contestants that may miss selection under particular conditions; the second focuses on two contestants each of whom answer 14 items correctly. This comparison raises questions about the proportion of correct to incorrect answers. Recommendations are made for future scoring of the test, which include reconsideration of negative marking and weighting as well as considering the inclusion of 150 or 200 contestants as opposed to 100 contestants for participation in the final round.

Management and Change in the South African National Defence Force

2005 ◽  
Vol 37 (2) ◽  
pp. 168-198 ◽  
Author(s):  
Terence Jackson ◽  
Elize Kotze
Keyword(s):  
South African ◽  
The South ◽  
National Defence
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