[R] delta-beta's

From: JEB Halliday <s0454869_at_sms.ed.ac.uk>
Date: Mon 27 Jun 2005 - 19:48:28 EST

Hi there

I have created a multivariate logistic regression model looking at the presence/absence of disease on farms. I would like to plot the diagnostic plots recommended by Hosmer & Lemeshow to look particularly for any points of high influence. In order to do this I need to extract values for delta-beta. The function dfbeta gives a value for change in each coefficient but I am looking for a composite value that gives an overall measure of change to the coefficients. It may be that dffits is this function but I cannot gather what this is or what it is calculated from?

If anyone has any advice re plotting H&L logistic regression diagnostics in R that would be greatly appreciated.
Also, can any of these functions be applied to glmmPQL mixed models?

Thanks very much
Jo Halliday



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