Application of a Rasch analysis to the examination of the perception of facial affect among persons with mental retardation

Abstract

An instrument for the assessment of perception of nonverbal facial affect was developed and administered to two separate groups of respondents: adults with mental retardation and adults without mental retardation. The instrument was developed and calibrated using an item response theory (Rasch) analysis on respondents without mental retardation. Following assurance of item stability, data were analyzed using an anchored analysis for persons without mental retardation. Cumulative score differences between the two groups were expected and were found. The Rasch analysis uncovered a difference in the structure of the latent trait of understanding of facial affect between the two groups. In view ..