Original Research

A psychometric investigation into the cross validation of an adaptation of the Ghiselli Predictability Index in personnel selection

Callie Theron, Deon Meiring
SA Journal of Industrial Psychology | Vol 32, No 4 | a240 | DOI: https://doi.org/10.4102/sajip.v32i4.240 | © 2006 Callie Theron, Deon Meiring | This work is licensed under CC Attribution 4.0
Submitted: 29 October 2006 | Published: 29 October 2006

About the author(s)

Callie Theron, University of Stellenbosch, South Africa
Deon Meiring, South African Police Services, Pretoria, South Africa

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Twigge, Theron, Steele and Meiring (2004) concluded that it is possible to develop a predictability index based on a concept originally proposed by Ghiselli (1956, 1960a, 1960b), which correlates with the real residuals derived from the regression of a criterion on one or more predictors. The addition of such a predictability index to the original regression model was found to produce a statistically significant increase in the correlation between the selection battery and the criterion. To be able to convincingly demonstrate the feasibility of enhancing selection utility through the use of predictability indices would, however, require the cross validation of the results obtained on a derivation sample on a holdout sample selected from the same population. The objective of this article consequently is to investigate the extent to which such a predictability index, developed on a validation sample, would successfully cross validate to a holdout sample. Encouragingly positive results were obtained. Recommendations for future research are made.


Personnel selection; Validation; Predictability; Index


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