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st: significant to non significant variable


From   "Ayayi, Ayi" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: significant to non significant variable
Date   Tue, 14 Jan 2014 11:36:49 +0000

- I have stata IC 10
- I am conducting three-multilevel  analysis let say


xtmixed y X1 X2 || country: || Microfinance . In this regression  X1 and X2 are statistically significant

Now I add  X3  the regression becomes:

xtmixed y X1 X2 X3|| country: || Microfinance

 In this regression X2 is no longer significant. The same problem arised when I add more than one variable 

I've checked for mulicollinearity among the variables with  VIF and Collin and all the VIF . There is no  collinearity . All the ViF are less than 2. So there is no mucollinearity

Could you be please let me know what is the problem and how can I handle it Many thanks for your time

Ayi Gavriel Ayayi
e-mail: [email protected]



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