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
retrieving weights from a polr object
3 messages · John Fox, Yihui Xie
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 <xieyihui at gmail.com> 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 <jfox at mcmaster.ca> 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 at 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.
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:xieyihui at gmail.com] Sent: September-28-08 1:33 AM To: John Fox Cc: r-help at 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 <xieyihui at gmail.com> 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 <jfox at mcmaster.ca> 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 at 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.