[R] Extracting slope coefficients for each team

Dear R-ers, I am analyzing longitudinal data using R. My objective is to test a relationship between a change in a variable (say X) and a change in another variable (say y). I have collected data at three time periods on both variables. I was able to run whether there was slope variability amon

[R] Convergence problem

Hi all, I am a facing a convergence problem when I test for variability of a slope among groups in lme. a) How do I know how many iterations the program is running? b) How do I increase the # of iterations c) Do I include the command to increase iterations in my equation? Thanks for your help! Am