An embedded and charset-unspecified text was scrubbed... Name: not available URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120724/f13439a6/attachment.pl>
stepwise in svyglm???
5 messages · Diana Marcela Martinez Ruiz, Bert Gunter, Frank E Harrell Jr +1 more
Stepwise variable selection is invalid in this context. Frank Diana Marcela Martinez Ruiz wrote
Hello, I want to know how to perform stepwise elimination of variables to svyglm thanks [[alternative HTML version deleted]]
______________________________________________ R-help@ 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.
----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/stepwise-in-svyglm-tp4637679p4637680.html Sent from the R help mailing list archive at Nabble.com.
... which begs the question: In what context is it valid? ;-) -- Bert
On Tue, Jul 24, 2012 at 3:00 PM, Frank Harrell <f.harrell at vanderbilt.edu> wrote:
Stepwise variable selection is invalid in this context. Frank Diana Marcela Martinez Ruiz wrote
Hello,
I want to know how to perform stepwise elimination of variables to svyglm
thanks
[[alternative HTML version deleted]]
______________________________________________ R-help@ 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.
----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/stepwise-in-svyglm-tp4637679p4637680.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ 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.
Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
None, except when the bootstrap is used correctly to fully document how well or poorly the modeling strategy worked and one is not interested in doing better or hasn't the time to do so. Cheers, Frank Bert Gunter wrote
... which begs the question: In what context is it valid? ;-) -- Bert On Tue, Jul 24, 2012 at 3:00 PM, Frank Harrell <f.harrell@> wrote:
Stepwise variable selection is invalid in this context. Frank Diana Marcela Martinez Ruiz wrote
Hello,
I want to know how to perform stepwise elimination of variables to
svyglm
thanks
[[alternative HTML version deleted]]
______________________________________________ R-help@ 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.
----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/stepwise-in-svyglm-tp4637679p4637680.html Sent from the R help mailing list archive at Nabble.com.
______________________________________________ R-help@ 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.
-- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
______________________________________________ R-help@ 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.
----- Frank Harrell Department of Biostatistics, Vanderbilt University -- View this message in context: http://r.789695.n4.nabble.com/stepwise-in-svyglm-tp4637679p4637800.html Sent from the R help mailing list archive at Nabble.com.
On Tue, Jul 24, 2012 at 2:48 PM, Diana Marcela Martinez Ruiz
<dianammr06 at hotmail.com> wrote:
Hello, I want to know how to perform stepwise elimination of variables to svyglm
If that's actually what you want to do (which as Frank points out, it probably isn't), you'll have to do it by hand. The function step() uses AIC. As far as I know, no-one has yet constructed valid analogues of AIC,BIC,CIC, ... under complex sampling (Alastair Scott and I are looking into it), so p-values are the only option, making the process even less useful. - thomas
Thomas Lumley Professor of Biostatistics University of Auckland