Eta-Squared and Partial Eta-Squared in Fixed Factor Anova Designs

1 Kennedy mistakenly adds the qualification to this formula "when F < 1." Since the relationship is purely algebraic, the formula is in fact valid for all possible values of F, although when F < 1, epsilon-squared is negative and customarily reported as zero.

2 Kennedy mistakenly states (p. 889) that "the sum of all eta-squared values equals unity," apparently a slip of the pen.

Cohen, J. Multiple regression as a general data-analytic system Psychological Bulletin, 1968, 70, 426-443.

Cohen, J. Some statistical issues in psychological research In B. B. Wolman (Ed.), Handbook of clinical psychology. New York : McGraw-Hill, 1965. Pp. 95-121.

Cohen, J. Statistical power analysis for the behavioral sciences New York: Academic Press, 1969.

Friedman, H. Magnitude of experimental effect and a table for its rapid estimation Psychological Bulletin, 1968, 70, 245-251.

Hays, W.L. Statistics for psychologists New York: Holt, Rinehart & Winston, 1963.

Kennedy, J.J. The eta coefficient in complex ANOVA designs EDUCATIONAL AND PSYCHOLOGICAL MEASUREMENT, 1970, 30, 885-889.

Kerlinger, F.N. Foundations of behavioral research. New York: Holt, Rinehart & Winston, 1964.