The population discrepancy between Cronbach's Coefficient Alpha (L. Cronbach, 1951) and scale reliability with fixed congeneric measure, uncorrelated errors, and sampling of subjects was studied. The difference is expressed in terms of the individual component violations of the assumption of equal tau-equivalence that is necessary and sufficient…

Unlike a substantial part of reliability literature in the past, this article is concerned with weighted combinations of a given set of congeneric measures with uncorrelated errors. The relationship between maximal coefficient alpha and maximal reliability for such composites is initially dealt with, and it is shown that the former is a lower…

Proposes an analytic approach to standard error and confidence interval estimation of scale reliability with fixed congeneric measures. The method is based on a generally applicable estimator stability evaluation procedure, the delta method. The approach, which combines wide-spread point estimation of composite reliability in behavioral scale…