Table 6.

Correction for lack of sphericity for the univariate approach to repeated measures.

Method	Correction Factor
Box	1/b
Geisser-Greenhouse (GG)	$\widehat{\epsilon }={\text{tr}}^2({\widehat{\mathbf{\sum }}}_{\ast })/[b·\text{tr}({\widehat{\mathbf{\sum }}}_{\ast }^2)]$
Huynh-Feldt (HF)	ε̃ = Nbε̂ − 2/b (N − r − bε̂)