HI, I am a studient, so don't be surprise if my question seems so simple for you... I have a dataframe with 6 qualitative variables divided in 33 modalities, 2 qualitatives variables and 78 lines. I use a glm to know wich variables have interactions... I would like to know if its normal that one (the first in alphabetical order) of the modalities of each qualitatives variable doesn't appear in the results? Here is what i did: glm<-glm(data$IP~data$temp*data$fvent*data$dirvent*data$Ensol+data$mois*data$mil, family=gaussian) summary(glm) anova(glm, test="Chisq") thanck you a lot and excuse me again for my little and perhaps simple question muriel varrin (french student in biostatistical)
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