DevChakraborty.com aka the JAFROC website

FAQ7

Expected value of the JAFROC figure of merit: Users of JAFROC are sometimes surprised that a modality (for example, mod-A) on which the observer marks some of the lesions without marking any normal image does not yield a perfect figure of merit (ϑ = 1) and conversely a modality (for example, mod-B) on which the observer marks some of the normal images and does not mark any of the lesions does not yield a zero figure of merit = 0). In fact it is observed that 0 <ϑ(mod-B) < ϑ (mod-A) < 1. The observer who marks only lesions is obviously better than the observer who marks only normal images. If the observer marked every lesion and did not mark any normal image, the figure of merit would be unity and if the observer marked every normal image and did not mark any lesion, the figure of merit would be zero.


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