# NA in LR model summary(R)

So, i was trying to improve mr LR model performing multiple linear regression on a dataset. I had a categorical variable region

Region(variable): Midwest Northeast South West

I made dummy variable for each of them and it did improved my model a bit.

Previous Model Summary

You've given all four regions a dummy variable, so these are perfectly multicollinear, and the (unpenalized?) regression doesn't have a unique solution. R automatically drops a column in this situation and reports the NA.