Torsten.Hothorn at rzmail.uni-erlangen.de
Wed May 7 17:57:58 MEST 2003
I spent some time now trying to understand how functions for the
computation of contrasts
passed to model.matrix are called. My problem is
that for the computation of some contrasts one needs `n' to be the number
of observations at each level of the factor of interest and for others the
number of levels is sufficient. For example, `contr.treatment' has code
for handling vector valued `n' (and ?contrasts states that `n' may be a vector).
Where can I find the condition under which `n = nlevel(x)' or `n =
table(x)' or how can I define what I would like to see?
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