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st: problem with the F test
I have a problem with the F test when I select the option ROBUST for the estimation .
I'm just running OLS regressions and when I select "robust" for the estimation of the variances the value of the F test is missing ! (I have 72 obs and 6 regresors)
If I don't select that option then I don't have the problem in the same estimation.
What can it be?
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