[R-sig-ME] Sample size and mixed models
A.Robinson at ms.unimelb.edu.au
Fri Dec 12 23:11:44 CET 2008
On Fri, Dec 12, 2008 at 09:21:15AM -0500, Robert Kushler wrote:
> I would argue that the larger value (individuals) is always more appropriate
> than the smaller value (clusters).
That's interesting - I have the opposite response, or at least that
the truth lies somewhere in the middle. Can you expand on why you
would argue that the larger value is always more appropriate than the
> However, the more important issue is that the "ungrouped" version of
> the likelihood should be used for these calculations. Using the
> "grouped data" likelihood omits the within cluster variation and
> inflates the estimate of predictive power.
I don't follow what you mean by "grouped" and "ungrouped" versions of
the likelihood. Can you clarify?
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