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st: Re: Generating 'moving sum' variable


From   "Michael Blasnik" <michael.blasnik@verizon.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: Re: Generating 'moving sum' variable
Date   Wed, 3 Sep 2003 11:27:18 -0400

If there are no missing data, then a quick approach to get a 7 period moving
sum is:

bysort subject (day) : gen exer_cum=sum(exercise)
by subject: gen exer_sum7=exer_cum-exercum[_n-6]

Michael Blasnik
michael.blasnik@verizon.net

----- Original Message ----- 
From: "KRISTIEN VERHEYEN" <kristien.verheyen@aht.org.uk>
To: <statalist@hsphsun2.harvard.edu>
Sent: Wednesday, September 03, 2003 7:39 AM
Subject: st: Generating 'moving sum' variable


> hello,
>
> I have a survival-time dataset with daily observations per subject. One of
> the (numeric) variables represents daily exercise distance. I now want to
> create a new variable that represents the sum of exercise distance in the
> previous week (or 7 days). It sounds similar to the 'moving average'
option
> for egen but there doesn't seem to be a 'moving sum' option. Please can
> somebody help? Thank you very much.
>
> Kristien Verheyen
> PhD student
>
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> Visit our website at www.aht.org.uk
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