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devag
2005 Nov 21
1
singular convergence with lmer function i lme4
...ng model;
lmer(a~b + (1|c), family=poisson, data=tab),
What I want to do is to see if number of recruits (a) is dependent on the
brood sex ratio (b) including brood identity (c) as random factor.
However, I get the following error message;
lmer(a~b + (1|c), family=poisson, data=tab)
Error in devAGQ(PQLpars, 1) : Unable to invert singular factor of downdated
X'X
In addition: Warning messages:
1: optim or nlminb returned message singular convergence (7)
in: LMEopt(x = mer, value = cv)
2: optim or nlminb returned message singular convergence (7)
in: LMEopt(x = mer, value = cv)
3: optim...