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I was wondering if someone could tell me what an overlay plot exactly is, in the context of linear regression.

Specifically, I have data to fit a model Y in terms of regressor variables x1 - x8 and the question asks me to

"Obtain the overlay plot of the fitted model on the actual values against the observed cases. Obtain the plot of the residuals against the fitted values."

What do I have to do here?

Thanks in advance!