Meryl, You?re getting this response because turnout is not an ordered factor variable. I believe the dependent variable in 1C is attention. Hope this helps! Tiona From: gov2001-l-bounces at lists.fas.harvard.edu [mailto:gov2001-l-bounces at lists.fas.harvard.edu] On Behalf Of Meryl Federman Sent: Wednesday, April 07, 2010 12:48 AM To: Class List for Gov 2001/E-2001 Subject: Re: [gov2001] oprobit? Hm... now I'm getting "response must have three or more levels" when I attempt?finaldata2 <- zelig(as.factor(turnout) ~ attention + contact + educ + income + black + age + dem + rep + lib + con + black:contact, data = final.data, model = "oprobit") If this looks familiar to you, let me know, if no, that's fine, just thought I'd run it by you. Thanks again for all your help! ~Meryl On Apr 6, 2010, at 8:59 PM, Akihiro Nishi wrote: Hi Instead of the outcome name, y, as.factor(y) will work. Please try! Akihiro For 1C - using the zelig with just saying "oprobit" instead of regular probit throws "response must be a factor". I've poked around a bit but haven't found the right thing yet... Any thoughts? ~Meryl _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hi Han- The signs of your coefficients are consistent with mine. I believe lower numbers on the attention scale indicate higher levels of attention, so negative coefficients for those variables are reasonable. Best, Megan On Wed, Apr 7, 2010 at 8:58 PM, Han He <han.he at college.harvard.edu> wrote: _______________________________________________ gov2001-l mailing list gov2001-l at lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l