[R] rpart for survival fits

[Prof Brian Ripley]

On Mon, 5 May 2008, Chang Liu wrote:

>
> Hello Gurus:
>
> When I plot a survival fit using rpart for the classification tree,

I don't think that is a 'classification tree': no classification is going 
on.  I will assume you called rpart() with a survival response.

> for each node, there is a decimal based number above the event/total. I 
> tried to see if it's the exponential ratio or logrithmics, neither seem 
> to be the case. I'm wondering if anyone knows what they are.

Yes, I am sure the author knows.  But to be precise, plotting the fit does 
not output those numbers, the text() method does.  What it adds is the 
frame$yval component of the fit, the 'fitted value' according to 
?rpart.object (which is printed when you print the fit).

You really do need to read the documentation to understand what the fitted 
values are in this case.  E.g. http://www.mayo.edu/hsr/techrpt/61.pdf

> Thanks,
> Karen
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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