ROC curves

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Sarah
Posts: 1
Joined: Thu Jan 10, 2013 11:23 am

ROC curves

Postby Sarah » Thu Jan 10, 2013 11:30 am

We have been working on some data using ROC curves and have a question about the coordinates of the curve. Can anybody shed any light on why sensitivity and specificty are given for the midway point between values (e.g. 1.5), rather than for the values themselves (1 and 2)? Also, is there anyway to obtain the sensitivity and specificity for the actual values to allow us to best determine the cutoff point to use?
Best wishes
Sarah

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