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st: collinearity

From   peter harper <>
Subject   st: collinearity
Date   Tue, 25 May 2004 17:06:27 +0100 (BST)

Dear Statalisters
I have a pooled cross sectional dataset, with some
variables not available for all years. When I run an
oprobit I get some year dummies dropped due to
First, does anyone know why this occurs and second is
how to avoid this occuring if this is possible.
If you need further clarification please let me know.
Thanks in advance 

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