st: examine the multilevel model's error covariance structure-"1st order auto-regressive"

["HsienYuan Hsu" <hsuhy0914@gmail.com>]

Dear members,

I want to examine the multilevel model's error covariance structure
(e.g., identity, unstructured) when using "xtmixed" in STATA.
I know STATA allows me to examine 1. independent; 2.exchangeable;
3.identity; 4. unstructured.

Could I examine "1st order auto-regressive" with "xtmixed" in STATA ??
If yes, what is the syntax for that?

Many thanks.
Mark
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