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Multiple Regression |
The plot of the residuals versus the predicted values is a classical diagnostic tool used in regression analysis. The plot is useful for discovering poorly specified models or heterogeneity of variance (Myers 1986, pp. 138 -139). The plot of R_GPA versus P_GPA in Figure 14.5 indicates no such problems. The observations are randomly scattered above and below the zero line, and no observations appear to be outliers.
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