olic method of
specifying linear hypothesis tests. I have been using that
extensively.
Cheers, Peter
On Mon, Apr 14, 2008 at 6:52 AM, Achim Zeileis
<[EMAIL PROTECTED]> wrote:
> On Thu, 10 Apr 2008, Peter Muhlberger wrote:
>
> This is on my wishlist for "sandwich" for a l
Hi Bill: Thanks for the reply! As you've no doubt guessed, I'm not a
statistician (I'm a social scientist). I hadn't given thought to
modeling the cluster-based covariance explicitly--interesting
possibility. My responses are drawn from some 60 discussion groups,
and a critic of my current
I've used optim to analyze some data I have with good results, but
need to correct the var-cov matrix for possible effects of clustering
of observations (respondents) in small groups (non-independence). Is
there any function to adjust the matrix? I heard some time ago that
the vcovHC function wou
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