Quantitative Aspects of Psychological Assessment
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Abnormality of a Change in Score

This Page Calculates the Abnormality (as a probability)
that a change in score occured given a Test-Retest correlation

Enter 1st Test Score

Enter 2nd Test Score   
Enter Practice Effect (optional)   
Enter Test-Retest reliability   
Enter Test Mean   
Enter Test Standard Deviation   

Optionally calculate Reliability of Change

Show Calculations in results

Calculator Disclaimer: This calculator has been developed for educational purposes, so that psychologists can learn to apply psychometric formula to clinical situations. It has been tested and validated with data from examples used to teach psychometrics on this site. It has not been tested or validated with a wide range of clinical data. Therefore we cannot offer any guarantee that the results of any calculation applied to clinical data is appropriate, accurate or valid.

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