Thanks for the details, I suspected something like that. I think that begs the question: what is the meaning of quantile regression through the origin? If the tau=.5 line does not pass through 1/2 the data how do I interpret the line?
On Tue, Oct 6, 2015 at 8:03 AM, Roger Koenker <rkoen...@illinois.edu> wrote: > > > On Oct 6, 2015, at 7:58 AM, Lorenz, David <lor...@usgs.gov> wrote: > > > > Did you verify that the correct percentages were above/below the > regression > > lines? I did a quick check and for example did not consistently get 50% > of > > the observed response values greater than the tau=.5 line. I did when I > > included the nonzero intercept term. > > Your "correct percentages" are only correct when you have an intercept in > the model, > without an intercept there is no gradient condition to ensure that. > > > > > > > >> Date: Mon, 5 Oct 2015 21:14:04 +0530 > >> From: Preetam Pal <lordpree...@gmail.com> > >> To: stephen sefick <ssef...@gmail.com> > >> Cc: "r-help@r-project.org" <r-help@r-project.org> > >> Subject: Re: [R] Quantile Regression without intercept > >> Message-ID: <56129a41.025f440a.b1cf4.fffff...@mx.google.com> > >> Content-Type: text/plain; charset="UTF-8" > >> > >> Yes..it works. .... Thanks ?? > >> > >> -----Original Message----- > >> From: "stephen sefick" <ssef...@gmail.com> > >> Sent: ?05-?10-?2015 09:01 PM > >> To: "Preetam Pal" <lordpree...@gmail.com> > >> Cc: "r-help@r-project.org" <r-help@r-project.org> > >> Subject: Re: [R] Quantile Regression without intercept > >> > >> I have never used this, but does the formula interface work like lm? > Y~X-1? > >> > >> > >> On Mon, Oct 5, 2015 at 10:27 AM, Preetam Pal <lordpree...@gmail.com> > >> wrote: > >> > >> Hi guys, > >> > >> Can you instruct me please how to run quantile regression without the > >> intercept term? I only know about the rq function under quantreg > package, > >> but it automatically uses an intercept model. Icant change that, it > seems. > >> > >> I have numeric data on Y variable (Gdp) and 2 X variables (Hpa and > >> Unemployment). Their sizes are 125 each. > >> > >> Appreciate your help with this. > >> > >> Regards, > >> Preetam > >> [[alternative HTML version deleted]] > >> > >> ______________________________________________ > >> R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > >> 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. > >> > >> > >> > >> > >> > >> > >> -- > >> > >> Stephen Sefick > >> ************************************************** > >> Auburn University > >> Biological Sciences > >> 331 Funchess Hall > >> Auburn, Alabama > >> 36849 > >> ************************************************** > >> sas0...@auburn.edu > >> http://www.auburn.edu/~sas0025 > >> ************************************************** > >> > >> Let's not spend our time and resources thinking about things that are so > >> little or so large that all they really do for us is puff us up and > make us > >> feel like gods. We are mammals, and have not exhausted the annoying > little > >> problems of being mammals. > >> > >> -K. Mullis > >> > >> "A big computer, a complex algorithm and a long time does not equal > >> science." > >> > >> -Robert Gentleman > >> [[alternative HTML version deleted]] > >> > >> > >> > >> > > > > [[alternative HTML version deleted]] > > > > ______________________________________________ > > R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see > > 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]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
