Estimation of the reliability of ratings

A procedure for estimating the reliability of sets of ratings, test scores, or other measures is described and illustrated. This procedure, based upon analysis of variance, may be applied both in the special case where a complete set of ratings from each ofk sources is available for each ofn subjects, and in the general case wherek ₁,k ₂, ...,k _n ratings are available for each of then subjects. It may be used to obtain either a unique estimate or a confidence interval for the reliability of either the component ratings or their averages. The relations of this procedure to others intended to serve the same purpose are considered algebraically and illustrated numerically.The writer wishes to acknowledge the helpful comments and suggestions of Professors E. E. Cureton, Harold Gulliksen, and E. F. Lindquist.