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Re: st: sd() does not work with forvalues

From   Richard Goldstein <>
Subject   Re: st: sd() does not work with forvalues
Date   Fri, 15 Jul 2011 13:31:02 -0400

my guess is that the error message refers to the line that starts "gen
nosddff`i'" rather than to the egen line -- and that line shouldn't work
outside the loop either; however, you have already calculated this value
and saved it in a variable so why not use that variable at that point?
i.e., change the line to

gen nosddff`i'=diffmedi`i'/sddf`i'


On 7/15/11 1:20 PM, Wilhelm Kluemper wrote:
> Hello STATA community,
> I am trying out a code where I want to create the standard deviation
> of a var as a new var with a loop:
> dfbeta
> forvalues i = 3/85 {
> egen df`i'med = median(_dfbeta_`i')
> egen sddf`i'= sd(_dfbeta_`i')
> gen diffmedi`i'=_dfbeta_`i'-df`i'med
> gen absdiffmedi`i' = abs(diffmedi`i')
> gen nosddff`i'= diffmedi`i'/sd(_dfbeta_`i')
> drop if nosddff`i'>=2
> }
> I keep getting this message:
> unknown function sd()
> It works perfectly without the forvalues loop but not within. Does
> anybody have a clue why that is and what I could do about it?
> Thanks already
> Wilhelm
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