Bela Bauer <[EMAIL PROTECTED]> writes: > Hi, > > I'm still not quite there with my H-F (G-G) correction code. I have it > working for the main effects, but I just can't figure out how to do it > for the effect interactions. The thing I really don't know (and can't > find anything about) is how to calculate the covariance matrix for the > interaction between the two (or even n) main factors. > I've looked through some books here and I've tried everything that came > to my mind, but I can't seem to be able to figure out an algorithm that > does it for me. > > Could anyone give me a hint about how I could do this? > (I'll append my code at the end, in case that helps in any way...)
I have given it to you before: My plan is to drop the explicit formula involving on/off diagonal elements of S and go directly at Box (1954), theorems 3.1 and 6.1, involving eigenvalues of TST', where T is the relevant residual operator. In the case where one of the factors have only two levels, I believe you just take differences and use the usual formula, but more than two levels is tricky. -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - ([EMAIL PROTECTED]) FAX: (+45) 35327907 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
