I thought you may want to know about the following typos in your examples page (http://gking.harvard.edu/zelig/docs/Examples.html) The third line of the 1st example: x.out <- setx(z.out, race = "whites") should be: x.out <- setx(z.out, race = "white") The second and third lines of the last example on the page should be separated by a comma: z.out <- zelig(ipip ~ wage1992 + prtyid + ideol, model = "ologit", data = list(immi1, immi2, immi3, immi4, immi5)) This command doesn't run because ipip is not a factor. It's easy enough to change and these are all easy to figure out, but I thought you might want to know. Thanks! Regina - Zelig Mailing List, served by Harvard-MIT Data Center Send messages: zelig(a)latte.harvard.edu [un]subscribe Options: http://lists.hmdc.harvard.edu/?info=zelig Zelig program information: http://gking.harvard.edu/zelig/