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From | Abdelouahid Tajar <a_tajar@hotmail.co.uk> |
To | statalist <statalist@hsphsun2.harvard.edu> |
Subject | RE: st: Area under the curve and C-statistics |
Date | Fri, 26 Oct 2012 21:56:04 +0100 |
Hi, Try mlogitroc mlogitroc generates multiclass ROC curves for classification accuracy based on multinomial logistic regression using mlogit. Details are in this link http://ideas.repec.org/c/boc/bocode/s457181.html Abdelouahid ---------------------------------------- > From: ariel.linden@gmail.com > To: statalist@hsphsun2.harvard.edu > Subject: re: st: Area under the curve and C-statistics > Date: Fri, 26 Oct 2012 11:12:30 -0400 > > Hi Amal, > > -lroc- is a post-estimation command for running after logistic regression, > so it is not surprising that you got that error. > > It seems to me that since a multinomial regression is basically a series of > logistic models, you could run each model separately (i.e., 2 vs 1, 3 vs 1, > 4 vs 1, etc.) and then plot all those results together using -roccomp-. > > Perhaps there is another way of doing this, but I just did a google search > and didn't find any relevant results. > > Ariel > > Date: Thu, 25 Oct 2012 19:38:49 +0000 > From: Amal Khanolkar <Amal.Khanolkar@ki.se> > Subject: st: Area under the curve and C-statistics > > Hi, > > I've used C statistics before and produced graphs that depict area under the > curve for logistic regression models. > > Is it possible to do the same for multinomial logistics regression models? > > I tried running: > > mlogit moth_wtgainbybmi i.mom_race2 age_mom sexx, base(1) rrr, if parity!=. > & gestwk_cat!=. & cigs_befx!=. & cigs_1stx!=. & cigs_2ndx!=. & cigs_3rdx!=. > & gestdb!=. & gesthy!=. & ht_cm!=. & plural==1 & edu_mom!=. & marriedxx!=. > > > lroc > > I get the error message 'last estimates not found...'. > > I assume that 'lroc' is suitable after using the 'logistic' command. > > Is there an equivalent for 'lroc' and 'roccomp' for multinomial logistic > regression? > > Thanks, > > /Amal. > > > * > * For searches and help try: > * http://www.stata.com/help.cgi?search > * http://www.stata.com/support/faqs/resources/statalist-faq/ > * http://www.ats.ucla.edu/stat/stata/ * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/