[R] C-statistic comparison with partially paired datasets
Frank E Harrell Jr
f.harrell at vanderbilt.edu
Wed Aug 12 13:53:13 CEST 2009
Hanneke Wijnhoven wrote:
> Does anyone know of an R-function or method to compare two C-statistics
> (Harrells's C - rcorr.cens) obtained from 2 different models in
> partially paired datasets (i.e. some similar and some different cases),
> with one continuous independent variable in each separate model? (in a
> survival analysis context)?
> I have noticed that the rcorrp.cens function can be used for paired data.
> Thanks for any help,
> Hanneke Wijnhoven
I'm having trouble seeing how the unpaired observations can contribute
information in general. If for example all of the observations were
unpaired, one C-statistic might be larger because it came from a dataset
with more extreme observations that were easier to discriminate.
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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