Is that making sense to apply robust regression after using Box Cox transformation. In my data, it seems by using log transformation I can improve the model since I have the violation of the assumptions. Now my question is after that I should apply OLS regression or Robust regression?

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    $\begingroup$ Maybe not! A few outliers could have a huge influence on the estimation of the transform parameter, so you probably should use robust regression already in estimating the box-cox transform $\endgroup$ – kjetil b halvorsen Oct 9 '17 at 9:22

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