[R] lme: Specifying a formula

[Christian Hennig]

Dear list,

I am faced with the following model:

y=E+P+M+H+PxE+Error

y is a response, E and P are factors with fixed effects.
M is a random effect nested in P and H is a random effect nested in M.
PxE is interaction of P and E.

It seems that I should fit such a model with the lme function of library
nlme, but I was not able to figure out from the help page how to specify the
formula. In the nlme documentation, the term "nested" is always associated
with a "grouping", and I do not know what my grouping is here.

Can anybody tell me how this must be specified in a call of lme?

Thanks,
Christian


***********************************************************************
Christian Hennig
University of Hamburg, Faculty of Mathematics - SPST/ZMS
 (Schwerpunkt Mathematische Statistik und Stochastische Prozesse,
 Zentrum fuer Modellierung und Simulation)
Bundesstrasse 55, D-20146 Hamburg, Germany
Tel: x40/42838 4907, privat x40/631 62 79
hennig at math.uni-hamburg.de, http://www.math.uni-hamburg.de/home/hennig/
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ich empfehle www.boag.de


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