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It is straightforward to specify an autoregressive random effects covariance structure using the nlme package in R, but, it seems to be unavailable in the lme4 package, at least according to a comment on the selected answer to this question, although that comment was from 2010.

Is it possible because of advances in lme4 or through another approach to specify an autoregressive random effects covariance structure in lme4?

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  • $\begingroup$ As far as I know, it's still not possible. What kind of model are you fitting that nlme isn't suitable? $\endgroup$ Commented Feb 22, 2016 at 15:47
  • $\begingroup$ Thanks. I just started using lme4 (instead of nlme). Maybe I should use nlme instead, then. $\endgroup$ Commented Feb 22, 2016 at 16:01

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