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I wonder, why do not need to specify the structure of the variance covariance matrix and the lmer function library lme4, since using the lm function library nlme this is possible. Thank you.

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  • $\begingroup$ Is your question about specifying/imposing a specific variance-covariance structure in lme4 (as opposed to nlme)? Did you read this related thread? $\endgroup$
    – chl
    Commented Apr 22, 2015 at 13:38
  • $\begingroup$ My question is for what reason does not specify to individual intra covariance structure in lme4. $\endgroup$
    – Matheus Henrique Dal Molin Rib
    Commented Apr 22, 2015 at 13:41
  • $\begingroup$ I think this thread (and many more via Google) addresses your question, then. $\endgroup$
    – chl
    Commented Apr 22, 2015 at 13:44

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