Splitting one dataset into training and test is still internal validation,
and it requires an enormous sample size (around 20,000 typically) in order
to be competitive with the bootstrap.
Note that the Design package has been replaced with rms, and rms has two
functions for external validation (va
I would like to do external validation using R software. So far I have used
packages like "Design" and "DAAG". However they perform internal validation
rather than external one. In order to perform external validation I would
have to split my data beforehand into training and test set, leave the te
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