Greetings,
I am trying to run a logistic regression model for binary data with a random
intercept and slope in R 2.6.1. When I use the code:
lmer1<-lmer(infect ~ time+gender + (1+time|id), family=binomial, data=ichs,
method="Laplace")
Then from:
summary(lmer1)
I get the message:
Error in if (any(sd < 0)) return("'sd' slot has negative entries") :
missing value where TRUE/FALSE needed
The model with just a random intercept has no difficulty. That is the model:
lmer1<-lmer(infect ~ time+gender + (1|id), family=binomial, data=ichs,
method="Laplace")
yields no such message. Can someone please tell me what this is about and how
to remedy?
Thank you,
Margaret Gorlin
PhD Student
UMDNJ SPH
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