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When a person's response to a number of questions is summarized by a single score and whenever that score is given a content-referent name, it is assumed that all questions are tapping a single common trait, attitude, or factor. The ATSCALE program provides a means of checking this assumption by evaluating the single-factoredness or unidimensionality of a scale r . well as its internal consistency. This program combines the major features of two programs which have been previously reported (Morrison, Campbell, & Wolins, 1967; Werner, 1967), but uses less core storage and time than either of the original programs.

ASTRALE: An evaluation of unidimensionality and internal consistency of responses to a series of questions