Hi All, Apparently, some folks have been having trouble plotting propensity scores simply by typing "plot(mout)" where mout is an output object from MatchIt. Ian and I have been having those troubles too. If anyone has a good solution, please send it out. In the meantime, we dealt with this problem by simply using "plot(density(xxx))" and the putting in the propensity scores for the treatment and control before and after matching in as the xxxs. The post-matching propensity scores can be extracted from the output from matchit using the match.data(mout,group="treat") or group="control" command. Note too that as far as I am aware, you need to calculate the propensity scores for the full, pre-matching sample "by hand"--that is, using zelig() or glm(). Best, Dan ---- Ph.D. Student Department of Government Harvard University Tutor, Currier House dhopkins(a)fas.harvard.edu http://www.danhopkins.org _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l

Hi All, Apparently, some folks have been having trouble plotting propensity scores simply by typing "plot(mout)" where mout is an output object from MatchIt. Ian and I have been having those troubles too. If anyone has a good solution, please send it out. In the meantime, we dealt with this problem by simply using "plot(density(xxx))" and the putting in the propensity scores for the treatment and control before and after matching in as the xxxs. The post-matching propensity scores can be extracted from the output from matchit using the match.data(mout,group="treat") or group="control" command. Note too that as far as I am aware, you need to calculate the propensity scores for the full, pre-matching sample "by hand"--that is, using zelig() or glm(). Best, Dan ---- Ph.D. Student Department of Government Harvard University Tutor, Currier House dhopkins(a)fas.harvard.edu http://www.danhopkins.org _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l