We develop uses for two recently proposed types of dynamic displays—rotation and animation—in regression diagnostics. Some of the general issues that we address by using these displays include checking for interactions and normality, assessing the need to transform the data, and adding predictors to a model. Animation is used in probability plotting and as an aid to understanding the effects of adding variables to a model. Rotation is used for threedimensional added-variable and residual plots, each of which may be effective for diagnosing the presence of an interaction.
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Cook et al. (1989) studied this question.
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