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st: scaling by average

From   Claudius Li <>
Subject   st: scaling by average
Date   Tue, 11 Dec 2012 16:10:50 -0500

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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