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Re: st: Pregibon's beta

From   SR Millis <>
Subject   Re: st: Pregibon's beta
Date   Mon, 28 Feb 2005 06:31:03 -0800 (PST)

Unless the number of covariate patterns is
substantially less than the number of cases, I'm not
certain that standard regression diagnostics are
terribly useful in logistic regression--the issue of
cutoff scores is moot.

SR Millis

--- Mariano Sana <> wrote:

> To detect influential cases in binary regression,
> Long & Freese (2003: 128)
> and Long (1997:101) mention Pregibon?s beta, a
> statistic that is "the
> counterpart to Cook?s distance for the linear
> regression model."  In Stata,
> you get Pregibon's betas by using -predict- with the
> option dbeta.
> Long and Freese do not give any particular rule of
> thumb about what value
> of this statistic would be a good threshold (i.e.,
> above that value we
> worry, below that value we don?t).

Scott R Millis, PhD, MEd, ABPP (CN & RP)

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