March 2018
Beginner to intermediate
570 pages
13h 42m
English
Content preview from Data Analysis with R, Second Edition - Second Edition
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Fourth Anscombe relationship
The following image depicts some of the linear regression diagnostic plots of the fourth Anscombe relationship:
Figure 9.12: The first and the fourth Anscombe relationships and their respective residual-fitted plots
Although it's difficult to say for sure, this is probably in violation of the assumption of constant variance of residuals (also called homogeneity of variance or homoscedasticity if you're a fancy-pants).
A more illustrative example of the violation of homoscedasticity (or heteroscedasticity) is shown in Figure 9.13:
Figure 9.13: A paradigmatic depiction of the residual-fitted plot of a regression ...
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