glht (multicomparisons) with a binomial response variable

Thanks very much, Frank, 
I will try, first I have to adjust your solution to my problem cause i have
just for months : april, may, june and july.

I will tell you!!
Thanks again

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Mario Garrido Escudero
PhD student
Dpto. de Biolog?a Animal, Ecolog?a, Parasitolog?a, Edafolog?a y Qca. Agr?cola
Universidad de Salamanca
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