Chapter 6
Diagnostics for Leverage and Influence
6.1 Observation 1 is identified as influential. It affects the coefficients for x3 and x5.
6.2 No observations show up as influential.
6.3 Observation 14 is identified as influential. It seriously affects the coefficients for x5 and x6.
6.4 No observations show up as influential.
6.5 No observations show up as influential.
6.6 No observations show up as influential.
6.7 No observations show up as influential.
6.8 Observations 50-53 show up as influential.
6.9 Observation 31 shows up as influential.
6.10 Appendix C establishes that 
Therefore,
Therefore,
6.11 Appendix C establishes
Therefore,
6.12 No observations show up as influential.
6.13 The last observation shows up as influential.
6.14 Observation 20 shows up as influential.
6.15 Observations 2 and 4 show up as influential.
6.16 In looking at the plots of the residuals vs. the predictors, we can see a pattern with SO2.
We take the log of SO2 to obtain the model
= 942 − 13.8EDUC + 3.34NONWHITE ...
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