[R] warning message for lmer model with poisson family

From: arams <ale.reimos_at_gmail.com>
Date: Wed, 04 Jun 2008 17:18:17 -0700 (PDT)


I'm trying to run an lmer model with family poisson but receive the following
warning message:

model<-lmer(count~tem+dat+alt+year+tem:dat+tem:alt+tem:year+dat:alt+dat:year+alt:year+(1|id),family=poisson) Error in objective(.par, ...) :
  Leading minor of order 2 in downdated X'X is not positive definite

I'm using the newest version of R and recently installed the following libraries: (lme4, matrix, lattice).
I don't understand what the warning message means or know how to fix it, please help!
My response variable is a count variable (n=551); 212 with value = 0, and the rest range between 1-3.

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Received on Thu 05 Jun 2008 - 00:46:26 GMT

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