Rating Dispersions: Comparing Raters' Spans and Variances

Abstract

This study reviewed relationships among and between four span and three variance measures of the dispersions of 36 persons' ratings of the interpersonal behavior of 6 to 8 small group peers and self. Indicating near functional equivalence, same-method, same-occasion span and variance measures correlated highly (mean r = .96). Separately derived from the 15 substantive scales and 140 items of Lorr and McNair's Interpersonal Behavior Inventory, these similar-method, same-occasion spans also correlated highly (.92). Each linked significantly but modestly with spans on a brief, eight-item survey of interpersonal conduct administered about two weeks earlier. Suggesting that such measures' generalizability may be quite limited, different-method, different-occasion span and variance measures correlated only modestly to faintly. Group leaders used wider spans than members, corroborating prior evidence linking larger dispersions with higher rater status and/or self-confidence.