What does that mean?
On 2019-04-29 8:09 p.m., DESPINA MICHAILIDOU wrote:
I am trying to run the following analysis and receive the following output glmm_Comb_PH_tod <- glmer(Comb_PH_tod~ CA_effect + (1 | ID/SCAN_DATE/Side), data=TAK_data, family=binomial(link = "logit")) summary(glmm_Comb_PH_tod) Output Error in length(value <- as.numeric(value)) == 1L : (maxstephalfit) PIRLS step-halvings failed to reduce deviance in pwrssUpdate
summary(glmm_Comb_PH_tod)
Error in summary(glmm_Comb_PH_tod) : object 'glmm_Comb_PH_tod' not found How can I fix that? Any suggestions? I am very new to R. Thank you in advance. Despina
The second error is relatively easy to understand; since your first command (using glmer(...)) didn't work, no object "glmm_Comb_PH_tod" has been created for you to summarize. The first part is harder. My guess would be that there's complete separation ; I've added a few more notes about the "PIRLS step-halving" error to the GLMM FAQ <http://bbolker.github.io/mixedmodels-misc/glmmFAQ.html>. But it's hard to know without seeing the actual data.