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Re: st: Simple mean imputation


From   Nick Cox <njcoxstata@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Simple mean imputation
Date   Fri, 17 Aug 2012 18:26:44 +0100

Austin has a direct solution.

Ona: For future reference note that you are confusing the -if- command
and the -if- qualifier. There are some other flavours of languages
other than Stata mixed in there too.

Nick

On Fri, Aug 17, 2012 at 6:19 PM, Austin Nichols <austinnichols@gmail.com> wrote:
> Ona McCarthy <omccarthy@tccr.org.uk> :
>
> egen m=rowmean(PAM1-PAM20)
> replace m=m*20
> egen miss=rowmiss(PAM1-PAM20)
> replace m=. if miss>2
>
>
> On Fri, Aug 17, 2012 at 1:09 PM, Ona McCarthy <omccarthy@tccr.org.uk> wrote:
>> Hello,
>>
>> A measure we are using consists of 20 items, the scoring of which is
>> simply a sum of all the items. It is not to be scored if more than 2
>> items are missing but if 1 or 2 items are missing, it calls for simple
>> mean imputation (I know this is an old method but the measure was
>> created in 1988). It's not the overall dataset mean that's imputed, but
>> the mean of the 18 or 19 items for each observation.
>>
>> My attempt is this:
>>
>> foreach var of varlist PAM1-PAM20 {
>> if var >=. missingcount = missingcount + 1 } if missingcount <3,
>> generate impflag=1, else impflag = 0
>>
>> but I'm now stuck. I know this is very basic but I can't figure it out.
>> I'd appreciate any help,
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