Attenuation-Corrected Estimators of Reliability.

ABSTRACT: The estimates of reliability are usually attenuated and deflated because the item-score correlation ( ρgX , Rit) embedded in the most widely used estimators is affected by several sources of mechanical error in the estimation. Empirical examples show that, in some types of datasets, the estimates by traditional alpha may be deflated by 0.40-0.60 units of reliability and those by maximal reliability by 0.40 units of reliability. This article proposes a new kind of estimator of correlation: attenuation-corrected correlation (R _AC ): the proportion of observed correlation with the maximal possible correlation reachable by the given item and score. By replacing ρgX with R _AC in known formulas of estimators of reliability, we get attenuat

SUBMITTER: Metsamuuronen J 

PROVIDER: S-EPMC9574086 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature