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st: comparison between models


From   Fabio Zona <fabio.zona@unibocconi.it>
To   statalist@hsphsun2.harvard.edu
Subject   st: comparison between models
Date   Wed, 13 Apr 2011 22:56:29 +0200 (CEST)

Hi to everybody,

I have two models:

Y = a + bx + bz

Y = a + bx + bk

the only difference is the variable x (in the second model), whereas in the first model I have z.

I want to see if the model with the k as indep variable is better than the model with z.
How can I test this? 
Thanks





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