[R] (no subject)

Blew, Ted TBlew at ETS.ORG
Thu May 31 20:41:49 CEST 2007

need a version of sd [or var] to return population standard deviation
(using n rather than n-1 denominator) that will operate on a dataframe
containing missings, i.e. unequal n's. any ideas? thx, ted. 
Ted (Edwin) Blew
tblew at ets.org 

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