[R] Intercept by level in GLM

[SAULEAU Erik-André]

Dear R-listers,

I have to explain "y", a continous variable, with two variables "t" and "p"
which are "factor variables": t is [1:12] and p is [1:18] (a value for y for
each combination t*p). OK, then I try to adjust models like: y=a_p + b*t (I
mean as many intercepts as levels of p) or y=a_p + b_p*t (as many intercepts
and coefficients  for t as levels of p). How is it possible to do that with
GLM? other package?

Thank you for advance, best regards,
EASauleau.

============================================
Erik-André SAULEAU

SEAIM
Hôpital du Hasenrain
BP 1070
87, Avenue de Altkirch
68051 MULHOUSE Cédex
Tel: 03-89-64-79-95
Mél: sauleauea at ch-mulhouse.fr
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