A Large-Scale Evaluation of Linear and Curvilinear Score Equating Models, Volumes I and II SAT TSWE

Author(s):

Marco, Gary Lee.; Petersen, Nancy S.; Stewart, E. Elizabeth

Publication Year:

1983

Report Number:

RM-83-02

Source:

ETS Research Memorandum

Document Type:

Report

Page Count:

793

Subject/Key Words:

Equated Scores, Mathematical Models, Models, Scholastic Aptitude Test (SAT), Scoring, Statistical Analysis, Test of Standard Written English (TSWE)

Abstract

The purpose of this study was to examine the adequacy of various linear and curvilinear score equating models when certain sample and test characteristics were systematically varied. Linear, equipercentile (direct and indirect through frequency estimation), and item characteristic curve (one- and three-parameter logistic) equating models were evaluated. ETS computer files for the April 1975 and November 1975 administrations of the SAT and the Test of Standard Written English provided the data for the study. The three-parameter logistic model was found to be most consistently accurate.

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