search for: traitment

Dear members, here is my trouble: My data consists of counts of trapped insects in different attractive traps. I usually use GLMs with a poisson error distribution to find out the differences between my traitments (and to look at other factor effects). But for some dataset where one traitment contains only zeros, GLM with poisson family fail to find any difference between this particular traitment and anyother one (even with traitment that have trapped a lot of insects). GLMs with gaussian family does not s...

Hi, I want to retrieve a value in the Dunnett's tables. I know the comparisons type, the percent of level,the number of traitments and the degrees of freedom. Is there a function to retrieve this value with this? Laurent Houdusse Analyste Programmeur