I’m trying to extract fitted values from a logit.gee model (m1), using m1$fitted.values However, this returns NULL (as does m1$coefficients and the other fields listed on p. 265 of the Zelig documentation). I know I can simply run a glm as a workaround, but nevertheless wanted to report this issue. Best Nils -- Nils B. Weidmann Professor of Political Science University of Konstanz http://cnc.uni.kn