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st: significance of differences

From   "Fabian Schönenberger" <>
Subject   st: significance of differences
Date   Fri, 01 Jun 2012 08:26:35 +0200

Dear Statalist
I want to compare if the difference of a specific variable between the first and fifth quintile is significant. 
I tried ttest with if; ttest var if varquintile==1 == var if varquintile==5 
However, this does not work. Any suggestions?

Many thanks in advance, Fabian 
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