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st: rescale grouped variables


From   "mdgross@comcast.net" <mdgrosscuff@comcast.net>
To   <statalist@hsphsun2.harvard.edu>
Subject   st: rescale grouped variables
Date   Thu, 31 Mar 2005 09:49:53 -0500

I am having trouble creating the following variable. I am sure it is quite
easy just escaping me for the past two days.

I have 80k horse races with a finishing position ranging from 1-2 to 1-18.
I have normalized the finishing position using the following:

sort raceid
by raceid: get nfinpos=_N
replace nfinpos=finpos/nfinpos

I would like to have the normalized finishing position rescaled to -.5 to
.5.

I can not find a command that lets me do this and allows by.

any help would be appreciated.

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