Estimating Predictive Validity When Range Restriction Due To Selection and Attrition Is Present

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A percentage of students academically attrite from Navy training schools and receive no final grade. Exclusion of these individuals from predictive validity and other statistics yields estimates based on a nonrandom sample of selectees. A technique was developed for imputing a final grade for selectees who do not complete a course so that they can be included in validation analyses. The methodology was based on a mathematical model in which the grades of course completers were distributed as the sum of truncated normal and normal variables. Another methodology, based on Guilford Case III and Guilford Case I corrections (Guilford, 1965), was also considered. The accuracy of these techniques was estimated using data from a variety of simulated school scenarios.

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