Hi 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 -- View this message in context: http://r.789695.n4.nabble.com/missclassification-in-estimating-proportions-tp4677385.html Sent from the R help mailing list archive at Nabble.com.
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
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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
On Oct 2, 2013, at 12:15 AM, pattebegga wrote:> Hi > > 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?This is the wrong place for this question, please send your statisical question to a venue where this would be on topic, or if this is homework, then consult your instructor. -- David Winsemius Alameda, CA, USA