Dear All, help(influence.measures) shows that there are generic functions for dfbetas(), covratio(), cooks.distance(), hatvalues(), and a few others, but apparently not for dffits(). Wouldn't it be more consistent to have a generic function for this in stats as well? Best, -- Wolfgang Viechtbauer Department of Psychiatry and Neuropsychology School for Mental Health and Neuroscience Maastricht University, P.O. Box 616 6200 MD Maastricht, The Netherlands Tel: +31 (43) 368-5248 Fax: +31 (43) 368-8689 Web: http://www.wvbauer.com