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A Computer Program for Estimating True-Score Distributions and Graduating Observed Scores Distributions

Lees, Diana M.; Lennon, Virginia; Lord, Frederic M.; Wingersky, Marilyn S.
Publication Year:
Report Number:
ETS Research Memorandum
Document Type:
Page Count:
Subject/Key Words:
Office of Naval Research, BIV20, Computer Software, Data Analysis, Goodness of Fit, Scoring


This paper describes a FORTRAN IV computer program for estimating true-score distributions and graduating (i.e., fitting or "smoothing") observed-score distributions. Possible uses of further computations based on the true-score distributions provided by this program are also listed. The model (by Lord) used to compute the true-score distribution, restrictions on the program's use, required input, and the output are all described in the text. A card-by-card description of input and a page-by-page description of output are included in the appendix.

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