[S] decomposing variance components

Bill Shipley (bshipley@courrier.usherb.ca)
Thu, 26 Feb 1998 13:17:58 -0500


I would like to know how one decomposes the variance components of a factor
into its levels. An example will clarify this. Let the model be:

varcomp(Y~F/S/I)
where F is a fixed factor with 4 levels and S and I are random factors in a
completely nested design. I want to estimate the variance components of S,
I and error within each of the four levels of F.

I have compared the output of SAS with that for SPLUS (restricted maximum
likelihood) and the total variance components of S, I and error agree.
However, in SAS I can also get the components of S, I and error for each
level of F.
Any help is welcome!
Bill Shipley
Departement de Biologie
Universite de Sherbrooke
Sherbrooke (Quebec)
CANADA J1K 2R1
bshipley@courrier.USherb.ca
voix: 819-821-8000 poste 2079
telecopieur: 819-821-8049
Visitez notre site WEB : http://www.usherb.ca/SCES/BIO/index.html

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