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Rigorously and Nonrigorously Parallel Test Forms

Author(s):
Lord, Frederic M.
Publication Year:
1964
Report Number:
RB-64-14
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
20
Subject/Key Words:
Office of Naval Research, Equated Scores, Error of Measurement, Parallel Test Forms, Test Theory, Testing Problems

Abstract

When several test forms are used interchangeably, they will not in practice, despite all efforts, be rigorously parallel. A definition of the standard error of measurement appropriate for this type of situation can be provided; however, it must be different from the definition in classical test theory. Appropriate formulas for the standard error of measurement and for other related quantities under both definitions are derived and compared; also sample statistics for estimating these quantities.

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