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st: Decreasing returns

From   "Ronnie Babigumira" <[email protected]>
To   "Statalist" <[email protected]>
Subject   st: Decreasing returns
Date   Thu, 3 Apr 2003 15:02:19 +0200

Hi (stata8, win2k, question part stata, part ...). I have a regression

        y = b0 + b1X1 + ..bnXn + e

The coeffcient on X1 is positive but I believe that it exhibits declining
returns. Is there a way (in stata) to test for this (apart from including a
square term for the variable in question).


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