CAT4 Irish Edition

CAT4 Irish standardisation

Irish age-based norms for the CAT4 were derived from the administration of four levels of the tests (D to G) to students in random samples of primary and second-level schools nationwide in 2012. The Irish version of the tests has the same content as the UK edition and is aimed at the following students:

The numbers of students used in the Irish standardisations were as follows:

Test reliability

The reliability of a test is a measure of the consistency of a student’s test scores over repeated testing, assuming conditions remain the same – that is, there was no fatigue, learning effect or lack of motivation. Tests with poor reliability might result in very different scores for a student across two test administrations.

The test reliabilities of the Irish version are high and are similar to the UK edition.

For interpreting the score of an individual student, the standard error of measurement (SEM) is a more useful statistic than a reliability coefficient. It indicates how large, on average, the fluctuations in standard scores may be. The SEM for the Verbal Reasoning Battery is 4.8, which indicates that there is a 68% chance that the student’s true verbal SAS will be in the range +/- 4.8. For example, for an average-performing student with a verbal SAS of 100, there is a 68% chance that his or her true verbal score is in a range from 95 to 105.

However, most tests show the 90% chance or confidence bands. For values around the average, the 90% confidence band is as follows:

For example, for an average-performing student with a verbal SAS of 100, there is a 90% chance that the true verbal score is in a range from 92 to 108.

Gender differences

The table below shows the average SAS scores for all the students who took part in the Irish standardisation, by gender.

Males were on average around three SAS points higher and around 1.5 SAS points higher for Spatial. Females were around one SAS point higher than for males the Verbal and Nonverbal Batteries.