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
Hanneke,
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
--
Frank E Harrell Jr Professor and Chair School of Medicine
Department of Biostatistics Vanderbilt University
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