The Rev.: An IBM BASIC program for Bayesian test interpretation

Abstract

The Rev. is a BASIC computer program for IBM-PC-compatible systems that provides Bayesian estimates of “true” scores from multiple scores measuring the same construct. Psychological reports often include test scores from earlier evaluations without objectively incorporating them into current findings. Using Thorndike’s formulas for objectively combining test scores while providing estimates with reduced standard errors, the Rev. is an interactive program that facilitates test interpretation by combining information from many test administrations. The user provides four easily obtainable pieces of information for each test administration. The output includes an estimated “true” score and the standard error of the estimate.