While Lawrence's analysis highlights the importance of considering outliers, it neither disconfirms the original Rothenberg and Sanders analysis of shirking on the impeachment vote nor findings of shirking generally. Indeed, when a systematic analysis of outliers is conducted for Republican voting on the Clinton impeachment, shirking results again emerge. While outlier analysis is important, it must be done systematically and not in an ad hoc manner.
Pregibon, Daryl. 1981. Logistic regression diagnostics. Annals of Statistics9:705-724.
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Rothenberg, Lawrence S., and Mitchell Sanders. 2000a. Lameduck politics: Impending departure and the votes on impeachment. Political Research Quarterly53:523-536.
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Rothenberg, Lawrence S., and Mitchell Sanders. 2000b. Severing the electoral connection: Shirking in the contemporary congress. American Journal of Political Science44: 310-319.