Typology of Deflation-Corrected Estimators of Reliability.

ABSTRACT: The reliability of a test score is discussed from the viewpoint of underestimation of and, specifically, deflation in estimates or reliability. Many widely used estimators are known to underestimate reliability. Empirical cases have shown that estimates by widely used estimators such as alpha, theta, omega, and rho may be deflated by up to 0.60 units of reliability or even more, with certain types of datasets. The reason for this radical deflation lies in the item-score correlation (Rit) embedded in the estimators: because the estimates by Rit are deflated when the number of categories in scales are far from each other, as is always the case with item and score, the estimates of reliability are deflated as well. A short-cut method to reach estimates closer to the true magnitu

SUBMITTER: Metsamuuronen J 

PROVIDER: S-EPMC9341485 | biostudies-literature | 2022

REPOSITORIES: biostudies-literature