[R] Robust or Sandwich estimates in lmer2

[Thomas Lumley]

On Wed, 19 Sep 2007, Doran, Harold wrote:

> This has come up before and I'll again ask the question "why would you
> want robust standard errors in lmer"?

And I'll again answer: using lmer() does not automatically guarantee correct model specification, either for the correlation structure or for the marginal variance.

      -thomas


Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle