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st: question about dummies for time periods

From   Carola Herrera <>
Subject   st: question about dummies for time periods
Date   Tue, 15 Jul 2008 18:37:52 -0700 (PDT)

> Dear all,
> Is it right to use dummies for periods of time of different
> length in the same regression?  I have one dummy for a
> decade, another dummy for a second decade, but the last
> dummy is for only 4 years.  Is this right for STATA or should all the
> dummies used in the same regression be even in terms of # of
> years?  The baseline is a decade.
> thansk in advance
> Carola Herrera


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