[R] Warning messages in lmer function (package lme4)

[CENDOYA, María Gabriela]

Hi:

I'm using function lmer from package lme4, and I get this message:



" There were 12 warnings (use warnings() to see them)"

So I checked them:

Warnings 1 to 11 said:

1: optim returned message ERROR: ABNORMAL_TERMINATION_IN_LNSRCH

 in: "LMEoptimize<-"(`*tmp*`, value = structure(list(maxIter = 50,   ...



and Warning 12 said:

12: IRLS iterations for glmm did not converge in: lmer(Enfermo ~ Bloque +
Trat * Var * dia + (1 | IDfruto), data = desinf,   ...



There was no error message in the call of lmer function, so:

What do these warnings mean?

Do these errors occur at earlier iterations but finally the model converges?

Can the model I got be trust?



Thanks, Gabriela.



PD: I'm using:

Windows XP ,

R 2.1.0,

Package lme4, version 0.95-6

And the fitted model was:

modelo1 <- lmer(Enfermo ~ Bloque+Trat*Var*dia+(1|IDfruto),

                 data=desinf,
subset=!desinf$dia==1&!desinf$Trat=="Sin_inoculo",

                 family=binomial)