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UKGSAT validity explained

UKGSAT reliability explained


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UKGSAT Reliability

The UKGSAT's reliability was - of course - of paramount interest to the test designers. Internal consistency and test-retest reliability (or stability) are the two measures most commonly used of the reliability of tests and questionnaires.

Internal consistency
If all of the questions are part of the same ability, then they should all be inter-correlated with each other. The average inter-correlation of all the items in a scale, together with the number of items in that scale, is used to calculate its coefficient alpha.
The UKGSAT’s two scales both have alphas exceeding 0.83, and for Numerical reasoning the UKGSAT has an alpha exceeding 0.87. Compared to other tests of ability and aptitude, this shows that the UKGSAT is reliable

Test-Retest Reliability (Stability)
If the UKGSAT really does measure abilities & aptitudes that will make a difference in the workplace, it is important that they be consistent over a period of time. Indeed, we can argue that if the test is reliable, then testing the same person at two different times should produce very similar results. The UKGSAT shows exceptional test-retest stability. Results were correlated over an average period of 4-6 months, and showed that both scales exceeded 0.82, so demonstrating excellent stability.

Unusually for an aptitude test, premium reports are available to UKGSAT users and anyone who commissions the UKGSAT as part of  

© ASDTi 2014

a recruitment or development activity. Reports include scores, graphs and explanations of the history and meaning of the tests.

Users can be sure that an administration of UKGSAT gives results that are both reliable and valid .

In other words test results can be replicated and demonstrably measure what they claim to be assessing.