On Tue, 4 Dec 2007, Charles C. Berry wrote: > > > I think coxph() leaves safe prediction off by default. You need to turn it > on.
Sorry for the misdirection, I see now that you are describing survreg() not coxph(). But even coxph() seems to barf on this. A possible workaround: > n <- data.frame(age=c(65,rep(mean(ovarian$age)), 10)) > predict(s, newdata=n)[-1] [1] -0.4182318 -1.9911592 > Chuck > > See > > ?predict.coxph > > Chuck > > On Wed, 5 Dec 2007, Gad Abraham wrote: > >> Hi, >> >> The following error looks like a bug to me but perhaps someone can shed >> light on it: >> >> > library(splines) >> > library(survival) >> > s <- survreg(Surv(futime, fustat) ~ ns(age, knots=c(50, 60)), >> data=ovarian) >> > n <- data.frame(age=rep(mean(ovarian$age), 10)) >> > predict(s, newdata=n) >> Error in qr.default(t(const)) : >> NA/NaN/Inf in foreign function call (arg 1) >> >> Thanks, >> Gad >> >> >> >> > sessionInfo() >> R version 2.6.1 (2007-11-26) >> i486-pc-linux-gnu >> >> locale: >> LC_CTYPE=en_AU.UTF-8;LC_NUMERIC=C;LC_TIME=en_AU.UTF-8; >> LC_COLLATE=en_AU.UTF-8;LC_MONETARY=en_AU.UTF-8;LC_MESSAGES=en_AU.UTF-8; >> LC_PAPER=en_AU.UTF-8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C; >> LC_MEASUREMENT=en_AU.UTF-8;LC_IDENTIFICATION=C >> >> attached base packages: >> [1] splines stats graphics grDevices utils datasets methods >> [8] base >> >> other attached packages: >> [1] survival_2.34 >> >> loaded via a namespace (and not attached): >> [1] rcompgen_0.1-17 >> >> >> >> -- >> Gad Abraham >> Department of Mathematics and Statistics >> The University of Melbourne >> Parkville 3010, Victoria, Australia >> email: [EMAIL PROTECTED] >> web: http://www.ms.unimelb.edu.au/~gabraham >> >> ______________________________________________ >> 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. >> > > Charles C. Berry (858) 534-2098 > Dept of Family/Preventive > Medicine > E mailto:[EMAIL PROTECTED] UC San Diego > http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 > > > Charles C. Berry (858) 534-2098 Dept of Family/Preventive Medicine E mailto:[EMAIL PROTECTED] UC San Diego http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901 ______________________________________________ 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.
