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For two groups where the mean of A > mean of B it is a plot of sensitivity at each of T thresholds (Probability of being in group A given you have a value less than or equal to t) against 1 - specificty (probability of being in group B given you have a value less than or equal to t).  For two groups where the mean of A > mean of B it is a plot of sensitivity at each of T thresholds (Probability of being in group A given you have a value less than or equal to t) against 1 - specificty (probability of being in group B given you have a value less than or equal to t) as seen [rocplot.jpg: here].

Working out 2 group signal detection diagnostics

The area under Receiver Operating Characteristic (ROC) curves is a way of describing the magnitude of how well separated two groups are with respect to some diagnostic.

For two groups where the mean of A > mean of B it is a plot of sensitivity at each of T thresholds (Probability of being in group A given you have a value less than or equal to t) against 1 - specificty (probability of being in group B given you have a value less than or equal to t) as seen [rocplot.jpg: here].

True

A

B

X

<= t

a

b

> t

c

d

None: FAQ/wavelength_eg (last edited 2014-03-31 11:50:25 by PeterWatson)