[R] a little statistics help

[VBMorozov@lbl.gov]

Dear R-guRus:
I am stuck with the following problem in R:
Let's say i have a data.frame with columns X,Y & Z.
X is a column of numbers, Y is a column of N 
factors "A", "B", "C", "D", etc and Z is a column of n 
factors "a", "b", "c", etc

if i do MyLm<-lm(X~Y*Z - 1) i get all N coefficients for Y-factors, but 
only n-1 coefficients for Z-factors, and only N*(n-1) coefficients for 
YZ interaction. Is that how it's supposed to be? I would like to get N 
coefficients for all factors Y and n coefficients for all factors Z - 
how can i do that?

Thank you very much,
Vlad


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