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...Response: Days Terms added sequentially (first to last) Df Deviance Resid. Df Resid. Dev P(>|Chi|) NULL 373 370.56 Block 3 71.05 370 299.51 2.543e-15 Variety 1 94.04 369 205.47 3.096e-22 Instar 3 126.21 366 79.26 3.553e-27 Variety:Instar 3 7.74 363 71.53 0.05 Other interactions were much less prominent. I'm only interested in the effect of Variety, and one would expect an effect of Instar, so I want to be able to block on Instar and Bloc...

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 (...

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 n...