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I start with 9 independent variables in my linear regression. However, I find that the overall F test value is not having significant P value and some variables are highly correlated.

Thus I discarded five independent variables and get both significant P value for the overall F test and no multicolinearity.

However, I am a bit afraid whether I am having any problem like omitted variable bias although I really like the result I have.

If there are no other additional variables I can use more, can I use this result for my work or should there be something done for this to be fixed?

Eric
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  • Have you checked out-of-sample performance? – SmallChess Mar 29 '17 at 04:19
  • My major concern is whether I am exposed to omitted variable bias after discarding many variables to have both significant F-test and no multiconlinearity problem. – Eric Mar 29 '17 at 07:57

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