Improved Spread-Location Visualization
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چکیده
Cleveland (1979, 1993) introduced the spread-location plot as a diagnostic plot suitable for many types of fitted statistical models. The spread-location plot which plots the absolute residual or square-root absolute residual vs. fitted value along with a robust loess smooth is a useful replacement for the customary practice of plotting residuals vs. fitted values. In this note, we show that neither absolute residual or square-root absolute residual is always appropriate for error distributions likely to be encountered in actual applications. Instead we recommend the simple practice of examining the distribution of the absolute residuals with a boxplot and choosing whatever transformation is necessary to obtain symmetry before constructing the spread-location plot. We conclude with an illustrative example.
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