[R] predict.lrm ( Design package) poor performance?

[Frank Harrell]

% correct is an improper scoring rule and a discontinuous one to boot.  So it
will not always agree with more proper scoring rules.

When you have a more difficult task, e.g., discriminating more categories,
indexes such as the generalized c-index that utilize all the categories will
recognize the difficulty of the task and give a lower value.  No cause for
alarm.

Frank

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Frank Harrell
Department of Biostatistics, Vanderbilt University
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