Hi guys,
I am testing the normally distributed errors assumptions for multiple regression with a visual inspection using a PPlot plot. Now, I have the suspicion that the errors are not normally distributed (see image below). I have two questions about this:
I am testing the normally distributed errors assumptions for multiple regression with a visual inspection using a PPlot plot. Now, I have the suspicion that the errors are not normally distributed (see image below). I have two questions about this:
 Is there any way to test this statistically and not visually?
 What are my options when the assumption turns out to be violated? What is the best way to proceed?
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