Hi, R users,
  I'm using the "lme" function in R to estimate a 2 level mixed effects
model, in which the size of the groups are different. It turned out that It
takes forever for R to converge. I also tried the same thing in SPSS and
SPSS can give the results out within 20 minutes. Anyone can give me some
advice on the lme function in R, especially why R cannot converge? Thanks.


Harry

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