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st: Change signicativity


From   "Ayayi, Ayi" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: Change signicativity
Date   Fri, 10 Jan 2014 14:00:09 +0000


Hi guys,

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


mixed y X1 X2 || student: || class: || school . In this regression  X1 and X2 are statistically significant

Now I add  X3  the regression becomes:

mixed y X1 X2 X3|| student: || class: || school 

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

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

Ayi Ayi

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