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 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
