Error in glmmADMB
Ben Bolker <bbolker at ...> writes:
Boris Berkhout <b.berkhout <at> ...> writes:
Dear list members, I am trying to fit a glmmADMB model on my data, but even after trying several things and reading different posts on forums I can't seem to fix the problem I am encountering. My response variable is the proportion of individuals surviving at a certain timepoint. The model looks like this: glmmSing8 =
glmmadmb(survF~temperature*snail*tank*plate+
(1|plate:replicate)+(1|week),
data=SurvSing8, family="binomial", zeroInflation=TRUE)
For the record, it looks like (based on off-list conversations) this problem was caused by a degenerate design matrix (i.e., some predictor variables were perfectly multicollinear). I will be adding a check for this situation to glmmADMB, but in the precise cause will always have to be diagnosed and dealt with by the user ... Ben Bolker