What are the significant problems of the log-log transformations? Any papers published about it? Enrico.
2012/4/14 Frank Harrell <f.harr...@vanderbilt.edu> > I used log-log in my book too until Terry Therneau alerted me to the > significant problems this creates. In the 2nd edition it will use log > S(t). > Frank > > Paul Miller wrote > > > > Hello Drs. Colosimo and Harrell, > > > > Thank you for your replies to my question. From Dr. Colosimo, I was able > > to determine that the SAS results can be replicated by adding the > > option conf.type="log-log" to my code as in : > > > > survobj <- survfit(survfrm, conf.type="log-log", data=Survival) > > > > Originally, it looked like the SAS results could be replicated using > > conf.type="plain". Applying this option to my actual data revealed that > > this was not the case, however. > > > >>From Dr. Harrell, I learned that using conf.type="log-log" may not be > such > a good idea. Interestingly though, I've seen at least one instance where > experts in the R community use this option in their book. The book is about > 10 years old. So maybe opinion about the use of this option has shifted > since then. > > > > Thanks, > > > > Paul > > > > [[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/Kaplan-Meier-analysis-95-CI-wider-in-R-than-in-SAS-tp4554559p4557695.html > Sent from the R help mailing list archive at Nabble.com. > > ______________________________________________ > R-help@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. > [[alternative HTML version deleted]] ______________________________________________ R-help@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.
