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# Re: st: scaling by average

 From Nick Cox To statalist@hsphsun2.harvard.edu Subject Re: st: scaling by average Date Wed, 12 Dec 2012 09:51:29 +0000

```The -sum()- here looks wrong as the function returns cumulative sums
and your additions are explicit any way. If I understand you correctly
you want

tsset state date

gen average = (score* count + L7.score*L7.count + F7.score*F7.count) /
(count + L7.count + F7.count)

but if this is weekly data, then

tsset state date, delta(7)
gen average = (score* count + L1.score*L1.count + F1.score*F1.count) /
(count + L1.count + F1.count)

is simpler.

Nick

On Tue, Dec 11, 2012 at 9:10 PM, Claudius Li
<claudiusli@janysanalytics.com> wrote:

> I've got an other question on the panel data set from my previous post.
> I've reshaped it so that I now have
>
> date state score time <other stuff>
>
> I want to add a variable normalized_score = score - average_for_day
> Where average_for_day = sum(score * count + score[n-7] * count[n-7]
> +score[n+7] * count[n+7] ... ) / sum(count + count[n-7] + count[n+7]
> ... )
>
> It seems a bit complicated to do this with loops. Is there a simpler way?
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```