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st: reverse lookup


From   Jeph Herrin <stata@spandrel.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: reverse lookup
Date   Tue, 08 Jan 2013 14:07:59 -0500

All,

I've just written the same awkward code for the untoldth time, and I'm thinking there must be a better way to do it.

The problem is to get a particular value of a variable into a local which corresponds to a particular value of another variable. I think this is usally call reverse lookup. For example, I might have -period- and -rate- and want to store the value of -rate- which corresponds to period = 1. My lazy solution is


 sum rate if period = 1
 local rate1 `=r(mean)'

That is, I summarize a single observation, then put the mean in local. Is there a better way to do this?

thanks,
Jeph

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