Estimation of the Box Correction for Degrees of Freedom from Sample Data in Randomized Block and Split-Plot Designs
- 1 March 1976
- journal article
- Published by American Educational Research Association (AERA) in Journal of Educational Statistics
- Vol. 1 (1) , 69-82
- https://doi.org/10.3102/10769986001001069
Abstract
It has been suggested that when the variance assumptions of a repeated measures ANOVA are not met, the df of the mean square ratio should be adjusted by the sample estimate of the Box correction factor, ɛ. This procedure works well when ɛ is low, but the estimate is seriously biased when this is not the case. An alternate estimate is proposed which is shown by Monte Carlo methods to be less biased for moderately large ɛ.Keywords
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