Thanks for bringing this issue in the book's description of survSplit() to my attention. It seems the change to the behavior of survSplit() was introduced in survival version 2.39-2. Up to (including) version 2.38-3, no formula was required if arguments 'end' and 'event' were specified.
A corrected pdf of the chapter is available at http://dwoll.de/r/gddmr/09_survival.pdf Daniel Wollschlaeger On August 19, 2016 4:21:31 AM PDT, "Vinzenz Völkel via R-help" <r-help at r-project.org> wrote: >Dear R-help-community, > > > >I hope, that?s the appropiate channel to post a quastion? > > > >For some days I have been struggling with a problem concerning the >?survSplit?-function of the package ?survival?. Searching the internet >I >have found a pretty good -German- description of Daniel Wollschläger >describing how to use survSplit: > > > >(https://books.google.de/books?id=9G4oBgAAQBAJ ><https://books.google.de/books?id=9G4oBgAAQBAJ&pg=PA345&lpg=PA345&dq=daniel+ >wollschl%C3%A4ger+survsplit&source=bl&ots=ajPgInB83d&sig=noQIAXMWe6oQJ-LwsTC >kroWdwHQ&hl=de&sa=X&ved=0ahUKEwiqwoX8q83OAhVlM5oKHSMGDrEQ6AEIHjAA#v=onepage& >q=daniel%20wollschl%C3%A4ger%20survsplit&f=false> >&pg=PA345&lpg=PA345&dq=daniel+wollschl%C3%A4ger+survsplit&source=bl&ots=ajPg >InB83d&sig=noQIAXMWe6oQJ-LwsTCkroWdwHQ&hl=de&sa=X&ved=0ahUKEwiqwoX8q83OAhVlM >5oKHSMGDrEQ6AEIHjAA#v=onepage&q=daniel%20wollschl%C3%A4ger%20survsplit&f=fal >se > > > >Mr. Wollschl?ger also provides the dataset, all of the code he used and >an >excerpt of his output: > > > > > >> library(survival) # f?r survSplit() > >> dfSurvCP <- survSplit(dfSurv, cut=seq(30, 90, by=30), end="obsT", > >+ event="status", start="start", id="ID", zero=0) > ># sortiere nach Beobachtungsobjekt und linken Intervallgrenzen > >> idxOrd <- order(dfSurvCP$ID, dfSurvCP$start) > >> head(dfSurvCP[idxOrd, ], n=7) > >obsT status sex X IV start ID > >1 30 0 f -1.3130607 A 0 >1 > >181 60 0 f -1.3130607 A 30 >1 > >361 63 1 f -1.3130607 A 60 >1 > >10 11 1 f -1.2282824 A 0 >10 > >100 27 1 m -0.1018403 B 0 >100 > >101 30 0 m -0.4079027 B 0 >101 > >281 42 1 m -0.4079027 B 30 >101 > > > > > >Unfortunaltely when I tried to copy Mr. Wollschl?gers operations using >his >very dataset, RStudio just returned the following error-message: > > > >> dfSurvCP2 <- >survSplit(dfSurv,cut=seq(30,90,by=30),end="obsT",event="status",start="start >",id="ID",zero=0) > >Error in formula.default(eval(parse(text = x, keep.source = >FALSE)[[1L]])) : > > > invalid formula > > > >I tried to figure out what?s wrong, but so far didn?t find any >solutions? I >would be very glad if anyone could help me out here. > > > >vhfv > > > > > [[alternative HTML version deleted]] > > > >------------------------------------------------------------------------ > >______________________________________________ >R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see >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. ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
