[zelig] Extract standard errors of fixed effects coefficients?

Dear Zelig users, I just started out with Zelig and have a *very* newbie-ish question: how do I extract the standard errors of fixed effects coefficients from the mer object returned by a mixed-effects zelig()? For instance: set.seed(2009) foo <- data.frame(dv=runif(20)<.3,iv=rnorm(20),group=rep(c("A","B","C","D"),times=5)) z.out <- zelig(dv~iv+tag(1|group), data=foo, model="logit.mixed") summary(z.out) I would now like to extract the estimated fixed effects coefficients and their standard errors (which are printed by summary() under "Fixed effects") - but the @fixef slot only contains the estimates, not the standard errors: summary(z.out)@fixef Did I overlook some slot? Or do I need to calculate the standard errors myself (if so, any pointers on how? At this point, I would probably just bootstrap them out of the original sample...)? I'm using Zelig 3.4-5 in R 2.9.2 (yes, these are not the newest versions, long story) and have read the FAQ and the "Statistical Commands" part of the documentation and have searched both on this list's and R-help's archive, to no success... Best, Stephan - Zelig Mailing List, served by Harvard-MIT Data Center Send messages: zelig(a)lists.gking.harvard.edu [un]subscribe Options: http://lists.gking.harvard.edu/?info=zelig Zelig program information: http://gking.harvard.edu/zelig/