[R] lmer - error asMethod(object) : matrix is not symmetric

2010-02-16 Thread Luisa Carvalheiro
Dear R users, I am having problems using package lme4. I am trying to analyse the effect of a continuous variable (Dist_NV) on a count data response variable (SR_SUN) using Poisson error distribution. However, when I run the model: summary(lmer((SR_SUN)~Dist_NV + (1|factor(Farm_code)) ,

[R] lmer - error asMethod(object) : matrix is not symmetric

2010-02-16 Thread Luisa Carvalheiro
Dear R-help, I am having problems using package lme4. I am trying to analyse the effect of a continuous variable (Dist_NV) on a count data response variable (SR_SUN) using Poisson error distribution. However, when I run the model: summary(lmer((SR_SUN)~Dist_NV + (1|factor(Farm_code)) ,

Re: [R] lmer - error asMethod(object) : matrix is not symmetric

2010-02-16 Thread Douglas Bates
This is similar to another question on the list today. On Tue, Feb 16, 2010 at 4:39 AM, Luisa Carvalheiro lgcarvalhe...@gmail.com wrote: Dear R users, I  am having problems using package lme4. I am trying to analyse the effect of a continuous variable (Dist_NV) on a count data response

Re: [R] lmer - error asMethod(object) : matrix is not symmetric

2010-02-16 Thread Luisa Carvalheiro
Dear Douglas, Thank you for your reply. Just some extra info on the dataset: In my case Number of obs is 33, and number of groups of factor(Farm_code) is 12. This is the information on iterations I get: summary(lmer(round(SR_SUN)~Dist_NV + (1|factor(Farm_code)) , family=poisson, verbose =TRUE))

Re: [R] lmer - error asMethod(object) : matrix is not symmetric

2010-02-16 Thread Douglas Bates
On Tue, Feb 16, 2010 at 10:54 AM, Luisa Carvalheiro lgcarvalhe...@gmail.com wrote: Dear Douglas, Thank you for your reply. Just some extra info on the dataset: In my case Number of obs is 33, and number of groups of factor(Farm_code) is 12. This is the information on iterations I get: