[R] Sensitivity and specificity in multi-class problems

From: Schäfer Christian <c.schaefer_at_dkfz-heidelberg.de>
Date: Sat, 19 May 2007 21:38:07 +0200


I'm relative new to R.
I'm looking for a convenient way to calculate sensitivity and specificity in machine-learning models (SVM, ...). In a two-class case it's quite simple by calculating the TP, TN, FP, FN rates once but in the multi-class case I have to do it as often as there exist different classes (for each class).
Of course I could do it manually in a for-loop or so. But is there a more convenient way? Perhaps on the basis of a confusion table?

Thanks in advance.

Christian Schaefer

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