R help - May 2006 - Giving Error

I tried your code, but it's giving the following
error..
Error in match.fun(FUN) : argument "FUN" is missing,
with no default

sorry (need a data.frame) :
lapply(split(as.data.frame(mat), gl(nrow(mat)/4, 4, nrow(mat))), cov)

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SUMANTA BASAK a ?crit :
> I tried your code, but it's giving the following
> error..
> Error in match.fun(FUN) : argument "FUN" is missing,
> with no default
> 
> 
> 		
> __________________________________________________________ 
> Yahoo! India Answers: Share what you know. Learn something new. 
> http://in.answers.yahoo.com
>

Hi R-users,

I have a data set with a particular type of interval-censored data: right 
and left censored data, but no other type of interval censoring. I need to 
fit a model with covariates to evaluate the influence of them on the 
survival time.

First: I use Surv of library(survival) to create my survival object. I have 
two possibilities:
                                     
Surv(c(1,1,NA,3),c(1,NA,2,3),type="interval2")
                                       # 1  1+   2-   3 , I do not [a,b] in 
any case.
                                      
Surv(c(1,1,2,3),c(1,2,2,3),c(1,0,2,1),type="interval")
                                          1   1+  2-   3

Second:Given that coxph is not valid for interval-censored type of data, I 
use survreg with covariates. 
survreg(Surv(c(1,1,NA,3),c(1,NA,2,3),type="interval2")  ~covariate)

Third: Now I need to fit a model with time-dependent covariates, but I only 
find examples of how to include time-dependent covariates when using coxph 
without left censoring (data=Rossi.txt,  Jhon Fox), and therfore the
"event"
in Surv is 0 until the event occurrs:

http://cran.r-project.org/doc/contrib/Fox-Companion/appendix-cox-regression.pdf

My question is: How could I fit a survival model that include right-left 
censoring and time-dependent covariates?


Thanks a lot in advance,

Berta.

On Wed, 3 May 2006, Berta wrote:
>
> My question is: How could I fit a survival model that include right-left
> censoring and time-dependent covariates?
>
Not with anything in the survival package, unfortunately.

 	-thomas

Thomas Lumley			Assoc. Professor, Biostatistics
tlumley at u.washington.edu	University of Washington, Seattle