[R] Weighted SD

Thomas Lumley tlumley at u.washington.edu
Mon Feb 1 21:32:54 CET 2010

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?


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

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