I have updated to R version 2.9. I also have R version 2.7 running on the same box. I get the following error in R 2.9; the command goes through without any errors in R 2.7. Would appreciate any feedback. Raghu _____________________________________________________________________________ library(MatchIt) data(lalonde) library(Zelig) m.out0 <- matchit(treat ~ age + educ + black + hispan + nodegree + married + re74 + re75, method = "nearest", data = lalonde) I > z.out0 <- zelig(re78 ~ treat + age + educ + black + hispan + nodegree + married + re74 + re75, data = match.data(m.out0), + model = "ls") Error in zelig.default(re78 ~ treat + age + educ + black + hispan + nodegree + : no slot "call" in the result [[alternative HTML version deleted]]