Estimating grade reliability

Abstract

Horst's formula for estimating the reliability of means of unequal numbers of scores is compared with an intra-class correlation formula derived by Cureton. The two formulas gave the same numerical value for r for grade-point ratios based on three quarters' work, but gave different values for grade-point ratios based on one quarters' work. "Where reliability estimates of unequal numbers of ratings were to be made, we would generally tend to use Cureton's formula when we were interested in reliability for the prediction of population behavior from a sample of that population or prediction from one sample of a population to another sample of the population." (PsycInfo Database Record (c) 2025 APA, all rights reserved)