[R] coxph weirdness

[Thomas Lumley]

YOu need to update the survival package:  from its NEWS file

Changes in version 2.36-14
   A supposedly cosmetic change to coxph in the last release caused
formulas with a "." on the right hand side to fail. Fix this and add a
case with "." to the test suite.


    -thomas

On Thu, Jul 26, 2012 at 3:26 PM, Peter Langfelder
<peter.langfelder at gmail.com> wrote:
> Hi all,
>
> I cant' wrap my head around an error from the coxph function (package
> survival). Here's an example:
>
> library(survival)
> n = 100;
> set.seed(1);
>
> time = rexp(n);
> event = sample(c(0,1), n, replace = TRUE)
> covar = data.frame(z = rnorm(n));
>
> model = coxph(Surv(time, event)~ . , data = covar)
>
> R gives the following error:
>
>> model = coxph(Surv(time, event)~ . , data = covar)
> Error in terms.formula(formula, specials = special) :
>   '.' in formula and no 'data' argument
>
> I read through the help file for coxph but nothing jumps out... what
> am I doing wrong?
>
>> sessionInfo()
> R version 2.15.0 Patched (2012-04-01 r58897)
> Platform: i686-pc-linux-gnu (32-bit)
>
> locale:
>  [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C
>  [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8
>  [5] LC_MONETARY=en_US.utf8    LC_MESSAGES=en_US.utf8
>  [7] LC_PAPER=C                LC_NAME=C
>  [9] LC_ADDRESS=C              LC_TELEPHONE=C
> [11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C
>
> attached base packages:
> [1] splines   stats     graphics  grDevices utils     datasets  methods
> [8] base
>
> other attached packages:
> [1] survival_2.36-13
>
> loaded via a namespace (and not attached):
> [1] tools_2.15.0
>
> Thanks in advance for all replies!
>
> Peter
>
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-- 
Thomas Lumley
Professor of Biostatistics
University of Auckland