[S] variance of treatment effects in a poisson glm

[Pierre Delfosse <pierre.delfosse@centexbel.be>]

Dear Splus users,

Having fitted a poisson glm on 2-way data (response ~ treatment + lot),
how can I compute an estimate of the variance of the treatment effects
(the implied model is 
        E(Yij)= MU * Ti * Lj and I am interested in Var(T)).

Thank you for your help.

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Pierre Delfosse                                 Address:   CENTEXBEL
info@chaineux.centexbel.be                      avenue du parc, 38
Telephone:      32-87-322443                    B-4650 Chaineux BELGIUM
Fax:                    32-87-340518


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