Correction of Rater Effects in Longitudinal Research With a Cross-Classified …

This study examines adverse consequences of using hierarchical linear modeling (HLM) that ignores rater effects to analyze ratings collected by multiple raters in longitudinal research. The most severe consequence of using HLM ignoring rater effects is the biased estimation of Levels 1 and 2 fixed effects and potentially incorrect significance tests about them. A crossclassified random effects …