Hi guys, hope you have a nice summer. I am wondering whether anybody knows how Gary uses the notation for error term with two parts: systematic bias and random errors, i.e., how he puts it in equation: Yi = Xi*B + mui + ei ???? Thanks in advance. Chunling -----Original Message----- From: gov2001-l-bounces(a)lists.fas.harvard.edu [mailto:gov2001-l-bounces@lists.fas.harvard.edu] On Behalf Of Gary King Sent: Thursday, February 10, 2005 10:59 PM To: yanbo(a)sloan.mit.edu; gov2001-l(a)lists.fas.harvard.edu Subject: Re: [gov2001-l] a question on multinominal logistic models multinomial logit can be estimated as a series of independent logits (unless you induce some parametric dependence). so the same issues apply. the min number of observations per category depends only on whether you wind up with perfect discrimination. in that case, the whole model falls apart and its not identified (the constant term goes to infinity, and so the other parameters can take on any value and you get the same likelihood). Gary On Thu, 10 Feb 2005, Yanbo Wang wrote: advice on given logistic entire MLR category per _______________________________________________ gov2001-l mailing list gov2001-l(a)lists.fas.harvard.edu http://lists.fas.harvard.edu/mailman/listinfo/gov2001-l