st: xtmixed: cov structure for within REs

[SR Millis <srmillis@yahoo.com>]

In xtmixed, is it possible to model the covariance structure for the within-individual random errors (R matrix), ie, an xtmixed equivalent of the "repeated" statement in SAS? 

Of course, using "random" and "repeated" statements in SAS likely over-specifies the model--and non-convergence often occurs.

Thanks,
Scott



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