This is dichotomania and is an inappropriate use of continuous
variables. Use an information-preserving approach such as rank
correlation. Also, this is not an R question.
Frank
-----------
Assume that I want to compare two methods, say skinfold measurement and
BMI, in how they classify subjects into four categories. In a 2x2 table
I would simply calculate sensitivity and specificity and NPV an PPV,
using the standard formulas, but can the same be directly applied in the
4x4 table? Or are other methods preferable?
Thanks in advance
Patrick
--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
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