Hi,
When I fit the mixed-effects model by lme, I got the convergence error code = 1，message = iteration limit reached without convergence (9). Even after I increase the iteration numbers, it still did not work. The only way I found to avoid the error message is to increase the number of iterations for the EM algorithm, which need to be at least 1100. But the weird thing is that the correlation between two random coefficients is always around 1, which is not true. I also tried to fit the model by lmer and it also gave me the correlation as 1. So I am thinking the error should be related with the improper starting value. But I do not know how to set up my desired starting value in lme function. Are there anybody know it? Or met the same problem with me before and know how to avoid the error? Thank you for your help.
Bests,
Jia



      
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