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Statistical Adjustments When Comparing Preexisting Groups ANCOVA

Author(s):
Lord, Frederic M.
Publication Year:
1968
Report Number:
RB-68-67
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
6
Subject/Key Words:
Analysis of Covariance (ANCOVA), Statistical Analysis

Abstract

An illustration is given showing why the analysis of covariance usually does not provide the appropriate adjustment to compensate for preexisting differences between nonexperimental groups.

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