Question

A plot of the standardized residuals versus the fitted values for a multiple regression model:

	A.	Can be used to check for outliers
	B.	Can be used to check for independence of the errors and non-constant variance
	C.	Can be used to check for non-constant variance
	D.	Can be used to check for outliers and non-constant variance

Answer 1

When conducting a residual analysis, a "residuals versus fits plot" is the most frequently created plot. It is a scatter plot of residuals on the y axis and fitted values (estimated responses) on the x axis. The plot is used to detect non-linearity, unequal error variances, and outliers.

Option D is correct.

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