Add option to return p.values to tidy.polr #833
Merged
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MASS::polr models by default do not provide p-values, as their t-values are not normally distributed. However, the MASS::dropmodel function offers a way to test the significance of terms in MASS::polr models (this is the prefered way of the MASS author to test for the significance of specific terms). This PR adds an option to tidy.polr to request such p.values.