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st: Two same dataset but results says problem of collinearity


From   vikramfinavker <vikramfinavker@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Two same dataset but results says problem of collinearity
Date   Thu, 30 Jun 2011 09:33:49 -0700 (PDT)

Dear All,

I have two identical datasets. However, when i run regression using one
dataset it says two of my year dummies are dropped due to the problem of
collinearity but when i run same regression using other database(same) it
drops all the year dummies and says they are collinear. It will be really
very helpful to me if anyone of you could suggest me whats going on here?

Regards,

Vikram

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