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ERIC Number: ED090303
Record Type: RIE
Publication Date: 1974
Pages: 27
Abstractor: N/A
Reference Count: 0
An Investigation of the Effects of Non-Homogeneous Within-Group Regression Coefficients Upon the F Test of Analysis of Covariance.
Kocher, A. Thel
The purpose of the present study was to investigate empirically the effects of violations of the assumption of homogeneity of within-group regression slopes on levels of significance in the F test of fixed-effects ANCOVA (analysis of covariance). The study used a Monte Carlo computer simulation procedure to generate data under the following conditions: (1) the covariate was a random variable; (2) the number of treatment groups was three; (3) treatment group n's were small to medium and were unequal as well as equal; (4) error variances were equal as well as unequal; and (5) covariate means were both equal and unequal. For each simulation, the proportion of F values exceeding certain critical values was compared to the nominal alpha corresponding to the critical values. (Author)
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 (Chicago, Illinois, April, 1974)