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ERIC Number: ED050172
Record Type: RIE
Publication Date: 1971-Jan
Pages: 26
Abstractor: N/A
Reference Count: 0
How Errors of Measurement Affect ANOVA, Regression Analyses, ANCOVA and Factor Analyses.
Porter, Andrew C.
In this paper problems caused by the existence of errors of measurement are identified for factor analysis, regression analysis, ANOVA, and ANCOVA. At least one detrimental effect is shown to exist for each type of analysis. When a researcher's interest is with infallible variables, he runs the risk of biased results from all of the procedures except ANOVA. The estimates of parameters in all four procedures suffer from inflated error variance. Some partial solutions are indicated, but clearly more work is needed on several of the problems. Most statistical procedures have been developed for models where variables are assumed to be free from errors of measurement. Since almost all educational research involves use of fallible variables, it is important that the effects of errors of measurement for the various models be understood and that the understanding be reflected in current research practice. (Author/GS)
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: N/A
Note: Paper presented at the Annual Meeting of the American Educational Research Association, New York, New York, February 1971