[R] Weighted SD

[Patrick Burns]

There is 'cov.wt'.  (If you have univariate
data, then you need to use 'as.matrix'.)

On 01/02/2010 20:32, 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?
>
> -tomas
>
> Thomas Lumley Assoc. Professor, Biostatistics
> tlumley at u.washington.edu University of Washington, Seattle
>
>
>
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-- 
Patrick Burns
pburns at pburns.seanet.com
http://www.burns-stat.com
(home of 'The R Inferno' and 'A Guide for the Unwilling S User')