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Analysis of Covariance for Nonrandomized Data ANCOVA

Author(s):
Hall, Charles E.
Publication Year:
1971
Report Number:
RB-71-27
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
20
Subject/Key Words:
Analysis of Covariance (ANCOVA), Data Collection, Educational Research, Mathematics, Psychological Studies

Abstract

The technique of analysis of covariance is examined for its relevance to educational and psychological investigations. A study of the arithmetic procedures, history, and statistical properties shows that, though the concepts are relevant to many data collection designs, the customary calculations are often inappropriate. Some suggestions are made relevant to altering the arithmetic procedures or the data collection design under some common conditions encountered in educational and psychological studies. (Author)

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