Dear Marlene, Have a look at the polr() function in the MASS package.
HTH, Thierry ---------------------------------------------------------------------------- ir. Thierry Onkelinx Instituut voor natuur- en bosonderzoek / Research Institute for Nature and Forest Cel biometrie, methodologie en kwaliteitszorg / Section biometrics, methodology and quality assurance Gaverstraat 4 9500 Geraardsbergen Belgium tel. + 32 54/436 185 thierry.onkel...@inbo.be www.inbo.be To call in the statistician after the experiment is done may be no more than asking him to perform a post-mortem examination: he may be able to say what the experiment died of. ~ Sir Ronald Aylmer Fisher The plural of anecdote is not data. ~ Roger Brinner The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data. ~ John Tukey -----Oorspronkelijk bericht----- Van: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] Namens marlene marchena Verzonden: vrijdag 31 juli 2009 12:04 Aan: r-help Onderwerp: Re: [R] Logistic regression and R Hi there, I take advantage of this chat to ask other question related to logistic regression. This is my first time as well. I have data that I want to model but I'm not sure if glm() is the correct function to use. My problem is as follow, I used Oxford Instability Score of the shoulder (OIS, independent variable) as indicative of the outcome ( 12-20 best, to 41-60 worst outcome, 5 possible results). Looking for many independent variables like categorical and numerical I want to see their prognostic impact on the outcome. There is a function which I can use to model my problem? I heard about multinomial logistic regression but I did not able to find nothing related to it. Any help would be much appreciated. Marlene. 2009/7/31 G. Jay Kerns <gke...@ysu.edu> > Dear Carlos, > > On Thu, Jul 30, 2009 at 6:11 PM, Carlos López<nato...@fisica.unam.mx> > wrote: > > Hello everybody :-) > > > > I have some data that I want to model with a logistic regression, > > most of the independent variables are numeric and the only dependent > > is > categorical, > > I was thinking that I could apply a logistic regression using glm > > but I wanted to deepen my knowledge of this so I tried to do some > > reading and found the "iris" dataset, now I would like to ask two > > things, first if > you > > know of any bibliography to read more about the logistic regression > > and R > so > > I could understand and interpret better the output, > > > See the following > > https://home.comcast.net/~lthompson221/<https://home.comcast.net/%7Elt > hompson221/> > > and the following specific link on that page: > > https://home.comcast.net/~lthompson221/Splusdiscrete2.pdf<https://home > .comcast.net/%7Elthompson221/Splusdiscrete2.pdf> > > which is a manual to accompany Agresti's _Categorical Data Analysis_. > In particular, you may want to check out Chapter 5 (and also some of > 4). > > > >and second, what could I > > do when I have some independent variables that are not only > >numerical but categorical too, i.e. mixed (categorical and > >numerical), can I still use > a > > logistic regression? > > Easy peasy, lemon squeezy. See page 78. > > Hope this helps, > Jay > > > > > > > > > > > > > *************************************************** > G. Jay Kerns, Ph.D. > Associate Professor > Department of Mathematics & Statistics Youngstown State University > Youngstown, OH 44555-0002 USA > Office: 1035 Cushwa Hall > Phone: (330) 941-3310 Office (voice mail) > -3302 Department > -3170 FAX > VoIP: gjke...@ekiga.net > E-mail: gke...@ysu.edu > http://www.cc.ysu.edu/~gjkerns/ <http://www.cc.ysu.edu/%7Egjkerns/> > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > [[alternative HTML version deleted]] Dit bericht en eventuele bijlagen geven enkel de visie van de schrijver weer en binden het INBO onder geen enkel beding, zolang dit bericht niet bevestigd is door een geldig ondertekend document. The views expressed in this message and any annex are purely those of the writer and may not be regarded as stating an official position of INBO, as long as the message is not confirmed by a duly signed document. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
