retrieving weights from a polr object

-----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 =

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

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

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

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