Dear Yihui, Yes, that's right. The reason that I missed it is that I checked a model that had been fit without a weights argument, that doesn't work even for an "lm" object (but does for a "multinom" object, produced by multinom() in the nnet package, which is what threw me off).
Thank you very much, John > -----Original Message----- > From: Yihui Xie [mailto:[EMAIL PROTECTED] > Sent: September-28-08 1:33 AM > To: John Fox > Cc: r-help@r-project.org > Subject: Re: [R] retrieving weights from a polr object > > Hi John, > > Aren't they in the component 'model' of the fitted object? > > ## > > options(contrasts = c("contr.treatment", "contr.poly")) > > house.plr <- polr(Sat ~ Infl + Type + Cont, weights = Freq, data = housing) > > head(house.plr$model) > Sat Infl Type Cont (weights) > 1 Low Low Tower Low 21 > 2 Medium Low Tower Low 21 > 3 High Low Tower Low 28 > 4 Low Medium Tower Low 34 > 5 Medium Medium Tower Low 22 > 6 High Medium Tower Low 36 > > house.plr$model$'(weights)' > [1] 21 21 28 34 22 36 10 11 36 61 23 17 43 35 40 26 18 54 13 9 10 8 > 8 12 6 7 9 18 6 7 15 13 13 7 5 11 14 19 37 17 23 40 3 5 23 > 78 46 43 48 45 86 > [52] 15 25 62 20 23 20 10 22 24 7 10 21 57 23 13 31 21 13 5 6 13 > ## > > Regards, > Yihui > -- > Yihui Xie <[EMAIL PROTECTED]> > Phone: +86-(0)10-82509086 Fax: +86-(0)10-82509086 > Mobile: +86-15810805877 > Homepage: http://www.yihui.name > School of Statistics, Room 1037, Mingde Main Building, > Renmin University of China, Beijing, 100872, China > > > > On Sun, Sep 28, 2008 at 3:00 AM, John Fox <[EMAIL PROTECTED]> wrote: > > Dear list members, > > > > The polr() function in the MASS package takes an optional weights argument > > for case weights. Is there any way to retrieve the case weights from the > > fitted "polr" object? Examining both the object and the code, I don't see > > how this can be done, but perhaps I've missed something. > > > > Any help would be appreciated. > > > > John > > > > ------------------------------ > > John Fox, Professor > > Department of Sociology > > McMaster University > > Hamilton, Ontario, Canada > > web: socserv.mcmaster.ca/jfox > > > > ______________________________________________ > > 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. > > ______________________________________________ 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.
