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...obability. Is there a good reason why one should or should not makes such an adjustment? In any case, will it matter when I'm interested only in the effect of Variety? Alternatively, could the underdispersion come from my ignoring the fact that the insects are measured at the four different instars and so the independence assumption is not true. I could not think of a way of taking that lack of independence into account. Suggestions welcome. Thanks -- ************************************************************* ___ Patrick Connolly {~._.~} HortResearch Great min...

Hi All! I am desperately needing some help figuring out how to calculate LD50 with a GLMM (probit link) or, more importantly, the standard error of the LD50. I conducted a cold temperature experiment and am trying to assess after how long 50% of the insects had died (I had 3 different instars (non significant fixed effect) and several different blocks (I did 4 replicates at a time)= random effect). Since there is no predict function for lmer, I used the following to get predicted values (thanks to a post by John Maindonald (I'll attach his post below)): model4 <- lmer (y...

Greetings I'm attempting to insert missing data on the smallest size class of cave cricket instars into a data frame. The data involve censusing photoplots (plots) of roosting cave crickets in which we discern in four instars or size classes. I need to insert data on size class one into a data frame that already has data on size classes two through four. The data can be merged by their cave na...