[R] Nelson-Aalen Estimator in R: Error Message

[peter dalgaard]

Hard to tell from the info you are giving us. I assume this regards the "mice" package?

One way to proceed is to set options(error=recover) which will dump you into the browser() environment when the error occurs and you can oka around and see what the value of variables was at the point of the error. This could give you a clue about what is going on.

-pd

> On 22 May 2018, at 15:29 , A.C. van der Burgh <a.c.vanderburgh using erasmusmc.nl> wrote:
> 
> Dear all,
> 
> Currently, I am doing a research project about serum sodium levels and falling. I am doing my analysis in R. I am performing the multiple imputation right now. I want to perform a survival analysis later, but therefore I need to specify the Nelson-Aalen estimator. My dataset is called DF1, the event indicator is Falls and the time variable is Time. The code that I use is as follows:
> 
> NAE <- nelsonaalen(data = DF1, statusvar = Falls, timevar = Time)
> 
> However, I get this error: Error in Surv(time, status) : Time variable is not numeric
> 
> If I do the following:
> 
> class(DF1$Time) [1] "numeric"
> 
> It shows that my variable is numeric. Can you help me with how I can solve this issue?
> 
> Thank you in advance.
> 
> Lisa
> 
> 
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-- 
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
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