Hello I am running R 2.0.1 on Windows, I am attempting to use Frank Harrell's 'fastbw' function (from the Design library), but I get an error that the fit was not created with a Design library fitting function; yet when I go to the help for fastbw (and also look in Frank's book Regression Modeling Strategies) it appears that fastbw should work with a model created with lm..... Relevant code <<<<< model.borrow.logols<- lm(logborrow~age + sex + racgp + yrseduc + needlchg + gallery + totni + inject + poly(year.of.int,3) + druginj + inj.years + HTLV3) fastbw(model.borrow.logols)>>>>Thanks in advance 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)
Peter Flom wrote:> Hello > > I am running R 2.0.1 on Windows, I am attempting to use Frank Harrell's > 'fastbw' function (from the Design library), but I get an error that the > fit was not created with a Design library fitting function; yet when I > go to the help for fastbw (and also look in Frank's book Regression > Modeling Strategies) it appears that fastbw should work with a model > created with lm..... > > Relevant code > <<<<< > model.borrow.logols<- lm(logborrow~age + sex + racgp + yrseduc + > needlchg + gallery + totni + inject + poly(year.of.int,3) + druginj > + inj.years + HTLV3) > > fastbw(model.borrow.logols)The error message was exactly correct. lm is not a Design fitting function. Try ols. -Frank> > > Thanks in advance > > > 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://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html >-- Frank E Harrell Jr Professor and Chair School of Medicine Department of Biostatistics Vanderbilt University