Hi Does anybody know, whether the Potential-Residual Plot, suggested by Hadi (1994) has already been implemented in R? Hadi, A. S. (1992), "A New Measure of Overall Potential Influence in Linear Regression," Computational Statistics & Data Analysis, 14, 1-27. (The proposed Potential-Residual Plot has been implemented in Data Desk) Thanks a lot for a hint Cheers Christoph -- Christoph Lehmann Phone: ++41 31 930 93 83 Department of Psychiatric Neurophysiology Mobile: ++41 31 570 28 00 University Hospital of Clinical Psychiatry Fax: ++41 31 930 99 61 Waldau lehmann at puk.unibe.ch CH-3000 Bern 60 http://www.puk.unibe.ch/cl/pn_ni_cv_cl.html