On Feb 1, 2010, at 3:32 PM, Thomas Lumley wrote:
On Mon, 1 Feb 2010, David Winsemius wrote:
On Feb 1, 2010, at 12:37 PM, Антон Морковин wrote:
Dear all,
what function can be used to calculate weighted SD or/and SE¿
There's no such stuff in 'base' package.
Seems as though lm with a weights argument could be used fairly
simply.
As I have pointed out from time to time, it depends on what the
weights are for -- are they precision weights, which lm() can
handle, or sampling weights, which it can't?
I'm looking forward to your book being released.
-tomas
Thomas Lumley Assoc. Professor, Biostatistics
tlum...@u.washington.edu University of Washington, Seattle
David Winsemius, MD
Heritage Laboratories
West Hartford, CT
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