Hello I am running R 1.8.1 on a Windows platform I am attempting to fit an ordinal logistic regression model, using the polr function, as described in Venables and Ripley. But when I try model4 <- polr(ypsxcat~committed + as.factor(sex) + as.factor(drugusey) + anycsw + as.factor(sex)*committed + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data duhray) I get a message that the polr function was not found. Any help appreciated thanks Peter Peter L. Flom, PhD Assistant Director, Statistics and Data Analysis Core Center for Drug Use and HIV Research National Development and Research Institutes 71 W. 23rd St www.peterflom.com New York, NY 10010 (212) 845-4485 (voice) (917) 438-0894 (fax)
help.search() is your friend: polr(MASS) Proportional Odds Logistic Regression HTH, Andy> From: Peter Flom > > Hello > > I am running R 1.8.1 on a Windows platform > > I am attempting to fit an ordinal logistic regression model, using the > polr function, as described in Venables and Ripley. But when I try > > model4 <- polr(ypsxcat~committed + as.factor(sex) > + as.factor(drugusey) + anycsw + as.factor(sex)*committed > + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data > duhray) > > I get a message that the polr function was not found. > > Any help appreciated > > thanks > > Peter > > Peter L. Flom, PhD > Assistant Director, Statistics and Data Analysis Core > Center for Drug Use and HIV Research > National Development and Research Institutes > 71 W. 23rd St > www.peterflom.com > New York, NY 10010 > (212) 845-4485 (voice) > (917) 438-0894 (fax) > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > >------------------------------------------------------------------------------ Notice: This e-mail message, together with any attachments,...{{dropped}}
Peter,
These things can be a little mysterious at the beginning. Lots of things
in R are arranged in groups called packages (or libraries). Some basic
ones come preinstalled with R, some you have to install yourself. If you
type
library()
at your R prompt you should get a list of all packages installed on your
system.
In order to use the functionality of a package you have to load it by
specifying its name as an argument to the library call. For example,
library(nlme)
will load the package named "nlme" (if it is installed on your
system) and
give you the functionality of the nlme package, i.e. access to its
functions.. Typing
search()
will show you what packages are already loaded on your system.
Search.help will allow you to find in which package your function resides
in. Typing
search.help(polr)
on my system returns
polr(MASS) Proportional Odds Logistic Regression
meaning that the polr function belongs to the package MASS which is
installed on your system. The only thing remaining to do is typing
library(MASS)
Of course, if MASS is not installed on your system you will get nothing in
response (actually you will get a message saying that nothing appropriate
was found). Then, you would need to go to a CRAN site and use their search
engine to find things about polr function.
Hope this helps,
Andy
__________________________________
Andy Jaworski
518-1-01
Process Laboratory
3M Corporate Research Laboratory
-----
E-mail: apjaworski at mmm.com
Tel: (651) 733-6092
Fax: (651) 736-3122
|---------+--------------------------------------------------->
| | "Peter Flom" <flom at ndri.org>
|
| | Sent by: |
| | r-help-bounces+apjaworski=mmm.com at stat.m|
| | ath.ethz.ch |
| | |
| | |
| | 03/03/2004 14:42 |
| | |
|---------+--------------------------------------------------->
>-----------------------------------------------------------------------------------------------------------------------------|
|
|
| To: <r-help at stat.math.ethz.ch>
|
| cc:
|
| Subject: [R] Location of polr function
|
>-----------------------------------------------------------------------------------------------------------------------------|
Hello
I am running R 1.8.1 on a Windows platform
I am attempting to fit an ordinal logistic regression model, using the
polr function, as described in Venables and Ripley. But when I try
model4 <- polr(ypsxcat~committed + as.factor(sex)
+ as.factor(drugusey) + anycsw + as.factor(sex)*committed
+ as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data duhray)
I get a message that the polr function was not found.
Any help appreciated
thanks
Peter
Peter L. Flom, PhD
Assistant Director, Statistics and Data Analysis Core
Center for Drug Use and HIV Research
National Development and Research Institutes
71 W. 23rd St
www.peterflom.com
New York, NY 10010
(212) 845-4485 (voice)
(917) 438-0894 (fax)
______________________________________________
R-help at stat.math.ethz.ch mailing list
https://www.stat.math.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
Peter Flom wrote:> I am running R 1.8.1 on a Windows platform > > I am attempting to fit an ordinal logistic regression model, using the > polr function, as described in Venables and Ripley. But when I try > > model4 <- polr(ypsxcat~committed + as.factor(sex) > + as.factor(drugusey) + anycsw + as.factor(sex)*committed > + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data > duhray) > > I get a message that the polr function was not found.Load the MASS package prior to calling polr(). library(MASS) -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 452-1424 (M, W, F) fax: (917) 438-0894
> I get a message that the polr function was not found.Did you remember to load the MASS library first? library(MASS) Hadley
"Peter Flom" <flom at ndri.org> writes:> Hello > > I am running R 1.8.1 on a Windows platform > > I am attempting to fit an ordinal logistic regression model, using the > polr function, as described in Venables and Ripley. But when I try > > model4 <- polr(ypsxcat~committed + as.factor(sex) > + as.factor(drugusey) + anycsw + as.factor(sex)*committed > + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data > duhray) > > I get a message that the polr function was not found. > > Any help appreciatedlibrary(MASS) (and help.search("polr") might have given you the idea) -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
> help.search("polr")Help files with alias or concept or title matching 'polr' using regular expression matching: polr(MASS) Proportional Odds Logistic Regression Type 'help(FOO, package = PKG)' to inspect entry 'FOO(PKG) TITLE'. > Did you ask "library(MASS)" first? hope this helps. spencer graves Peter Flom wrote:>Hello > >I am running R 1.8.1 on a Windows platform > >I am attempting to fit an ordinal logistic regression model, using the >polr function, as described in Venables and Ripley. But when I try > >model4 <- polr(ypsxcat~committed + as.factor(sex) > + as.factor(drugusey) + anycsw + as.factor(sex)*committed > + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data >duhray) > >I get a message that the polr function was not found. > >Any help appreciated > >thanks > >Peter > >Peter L. Flom, PhD >Assistant Director, Statistics and Data Analysis Core >Center for Drug Use and HIV Research >National Development and Research Institutes >71 W. 23rd St >www.peterflom.com >New York, NY 10010 >(212) 845-4485 (voice) >(917) 438-0894 (fax) > >______________________________________________ >R-help at stat.math.ethz.ch mailing list >https://www.stat.math.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html > >
On 3 Mar 2004 at 15:42, Peter Flom wrote:> Hello > > I am running R 1.8.1 on a Windows platform > > I am attempting to fit an ordinal logistic regression model, using the > polr function, as described in Venables and Ripley. But when I tryIt would help if you started by saying library(MASS) Not knowing that, you could find out by trying help.search("polr") Kjetil Halvorsen> > model4 <- polr(ypsxcat~committed + as.factor(sex) > + as.factor(drugusey) + anycsw + as.factor(sex)*committed > + as.factor(sex)*as.factor(drugusey)+as.factor(sex)*anycsw, data > duhray) > > I get a message that the polr function was not found. > > Any help appreciated > > thanks > > Peter > > Peter L. Flom, PhD > Assistant Director, Statistics and Data Analysis Core > Center for Drug Use and HIV Research > National Development and Research Institutes > 71 W. 23rd St > www.peterflom.com > New York, NY 10010 > (212) 845-4485 (voice) > (917) 438-0894 (fax) > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html