[R] Greenhouse-Geisser correction

[Heleen Slagter]

Hi all,

I was wondering whether there are any packages that provide for the 
Greenhouse-Geisser correction, an adjustment used in univariate repeated 
measures when the sphericity assumption is violated (both numerator and 
denominator degrees of freedom are multiplied by GG-epsilon, and the 
significance of the F ratio is evaluated with the new degrees of freedom)? I 
have seen a few emails with the same question, to which nobody replied, but 
am hoping that maybe in the mean time somebody has tried to work this out.

Thanks much,
Heleen