Tom Murray
This project assesses psychometric aspects of the STAGES sentence completion test (SCT) using data from 740 scored surveys, and some of the analysis applies to all variations of the SCT for ego development (meaning making maturity). The goals of this research project include: (1) to apply item response theory (IRT) and Rasch analysis to determine item-level psychometric properties of the SCT that were previously unaddressed in SCT research; and (2) to further investigate suspected problems with the ogive cutoff method for aggregating item scores in the SCT and propose alternatives. The psychometric analysis includes: within-test item normality, item standard deviations, test length analysis, factor analysis, characteristics of and correlations among each item, overall test strength, and construct levels discrimination. A range of issues with the standard ogive cutoff method are described, and a new item aggregation method is then proposed.
Tags: psychometrics, Murray, Adult ego development, ogive cutoff, sentence completion test, stages
