Obtain a linear model to predict duration y from some or all of the variables m , d , s 1 , s 2 and describe the steps taken to construct the model. Plot the residuals versus the fitted values to verify that the model satisfies necessary assumptions. Also obtain a plot to determine whether time should be included as an independent variable.

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Chapter 8, Problem 22SE

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Obtain a linear model to predict duration y from some or all of the variables m, d, s1, s2 and describe the steps taken to construct the model.

Plot the residuals versus the fitted values to verify that the model satisfies necessary assumptions.

Also obtain a plot to determine whether time should be included as an independent variable.

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