Hello all! Can we set the threshold to alternative values than 0.50 in Logit models? If not, it would have been a nice addition if it is easy. One step (or many more complex) would be to produce results for i.e. 10 alternative levels and also the corresponding ROC curve.

Thanks a lot! I will try that!

On Sun, Apr 7, 2019 at 4:19 PM Allin Cottrell <cottrell(a)wfu.edu <mailto:cottrell@wfu.edu>> wrote: On Sun, 7 Apr 2019, Periklis Gogas wrote: > Hello all! > > Can we set the threshold to alternative values than 0.50 in Logit models? > If not, it would have been a nice addition if it is easy. > One step (or many more complex) would be to produce results for i.e. 10 > alternative levels and also the corresponding ROC curve. Try Peter Summers' "roc" function package. If you're unfamiliar with such packages see /Help/Packages.

Thank you Sven, What does the $yhat mean actually? PG *Periklis Gogas <http://www.econ.duth.gr/personel/dep/gkogkas/index.en.shtml>* Associate Professor of Economic Analysis and International Economics Department of Economics, Democritus University of Thrace Associate Editor - Journal of Economic Asymmetries <https://www.journals.elsevier.com/the-journal-of-economic-asymmetries/> Euro Area Business Cycle Network - Fellow <http://www.eabcn.org/person/periklis-gogas> The Rimini Centre for Economic Analysis - Fellow <http://www.rcfea.org/component/option,com_frontpage/Itemid,1/> The Society for Economic Measurement - Member <http://sem.society.cmu.edu/home.html> Institute for Nonlinear Dynamical Inference (INDI) - Charter Fellow <http://icemr.ru/institute-for-nonlinear-dynamical-inference/> On Sun, Apr 7, 2019 at 8:14 PM Sven Schreiber <svetosch(a)gmx.net&gt; wrote: > Am 07.04.2019 um 17:17 schrieb Periklis Gogas: > > Thanks a lot! I will try that! > > > On Sun, Apr 7, 2019 at 4:19 PM Allin Cottrell <cottrell(a)wfu.edu > > <mailto:cottrell@wfu.edu>> wrote: > > > > On Sun, 7 Apr 2019, Periklis Gogas wrote: > > > > > Hello all! > > > > > > Can we set the threshold to alternative values than 0.50 in Logit > > models? > > > If not, it would have been a nice addition if it is easy. > > > One step (or many more complex) would be to produce results for > > i.e. 10 > > > alternative levels and also the corresponding ROC curve. > > > > Try Peter Summers' "roc" function package. If you're unfamiliar with > > such packages see /Help/Packages. > > Maybe this is redundant, but let me just add that the $yhat accessor > after logit contains the predicted probability, not a binary 0-1 > outcome. So a user may map these probabilities to 0-1 with any threshold > she chooses. > > (For example like: series y01 = ($yhat > 0.3)) > > cheers > sven > > _______________________________________________ > Gretl-users mailing list > Gretl-users(a)lists.wfu.edu > http://lists.wfu.edu/mailman/listinfo/gretl-users >

Hi Periklis, In general, the $yhat accessor contains the predicted values of the dependent variable from the last model estimated. As Sven mentioned, for logit & probit these are estimated probabilities. Could you provide more context for the error you’re getting? I hope the roc package is useful for you; just let me know if you have any questions about it. Peter Sent from my iPad On Apr 7, 2019, at 3:40 PM, Periklis Gogas <perrygogas(a)gmail.com&gt; wrote: I get this error ? FF = $yhat The statistic you requested is not available PG *Periklis Gogas <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.econ.duth.gr%2fper... Associate Professor of Economic Analysis and International Economics Department of Economics, Democritus University of Thrace Associate Editor - Journal of Economic Asymmetries <https://www.journals.elsevier.com/the-journal-of-economic-asymmetries/> Euro Area Business Cycle Network - Fellow <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.eabcn.org%2fperson... The Rimini Centre for Economic Analysis - Fellow <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.rcfea.org%2fcompon... The Society for Economic Measurement - Member <http://sem.society.cmu.edu/home.html> Institute for Nonlinear Dynamical Inference (INDI) - Charter Fellow <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ficemr.ru%2finstitute-f... On Sun, Apr 7, 2019 at 10:28 PM Periklis Gogas <perrygogas(a)gmail.com&gt; wrote: > Thank you Sven, > > What does the $yhat mean actually? > > PG > > *Periklis Gogas > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.econ.duth.gr%2fper... > Associate Professor > of Economic Analysis and International Economics > Department of Economics, Democritus University of Thrace > > Associate Editor - Journal of Economic Asymmetries > <https://www.journals.elsevier.com/the-journal-of-economic-asymmetries/> > Euro Area Business Cycle Network - Fellow > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.eabcn.org%2fperson... > The Rimini Centre for Economic Analysis - Fellow > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2fwww.rcfea.org%2fcompon... > The Society for Economic Measurement - Member > <http://sem.society.cmu.edu/home.html> > Institute for Nonlinear Dynamical Inference (INDI) - Charter Fellow > <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2ficemr.ru%2finstitute-f... > > > On Sun, Apr 7, 2019 at 8:14 PM Sven Schreiber <svetosch(a)gmx.net&gt; wrote: > >> Am 07.04.2019 um 17:17 schrieb Periklis Gogas: >> > Thanks a lot! I will try that! >> >> > On Sun, Apr 7, 2019 at 4:19 PM Allin Cottrell <cottrell(a)wfu.edu >> > <mailto:cottrell@wfu.edu>> wrote: >> > >> > On Sun, 7 Apr 2019, Periklis Gogas wrote: >> > >> > > Hello all! >> > > >> > > Can we set the threshold to alternative values than 0.50 in >> Logit >> > models? >> > > If not, it would have been a nice addition if it is easy. >> > > One step (or many more complex) would be to produce results for >> > i.e. 10 >> > > alternative levels and also the corresponding ROC curve. >> > >> > Try Peter Summers' "roc" function package. If you're unfamiliar >> with >> > such packages see /Help/Packages. >> >> Maybe this is redundant, but let me just add that the $yhat accessor >> after logit contains the predicted probability, not a binary 0-1 >> outcome. So a user may map these probabilities to 0-1 with any threshold >> she chooses. >> >> (For example like: series y01 = ($yhat > 0.3)) >> >> cheers >> sven >> >> _______________________________________________ >> Gretl-users mailing list >> Gretl-users(a)lists.wfu.edu >> http://lists.wfu.edu/mailman/listinfo/gretl-users >> <https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.wfu.edu%2fmailma... >> > _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu https://linkprotect.cudasvc.com/url?a=http%3a%2f%2flists.wfu.edu%2fmailma... _______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users

On Mon, 8 Apr 2019, Periklis Gogas wrote: > Hello Peter, > > The ROC package seems great! I only used it for a while but I think it is > better than what I imagined. > Thank you very mush for that! > > As you can see below in any simple Logit model I run I get this message > like $yhat is not defined... > Take a look here: > > http://postimg.cc/WhzG8pMM > > I also attach the relevant small Gretl data fle. You get $yhat if you run the "logit" command from a script or the console. If you use the GUI interface you get the fitted values via the "Save" menu of the model window. ------------------------------------------------------- Riccardo (Jack) Lucchetti Dipartimento di Scienze Economiche e Sociali (DiSES) Università Politecnica delle Marche (formerly known as Università di Ancona) r.lucchetti(a)univpm.it http://www2.econ.univpm.it/servizi/hpp/lucchetti -------------------------------------------------------_______________________________________________ Gretl-users mailing list Gretl-users(a)lists.wfu.edu http://lists.wfu.edu/mailman/listinfo/gretl-users