The JAFROC software is used to analyze free-response data from human observers. It is essential that the FROC data is collected carefully in order to ensure accurate results. JAFROC has been extensively tested and validated using a simulator that takes into account inter-image and intra-image correlations of the ratings. When a case is jackknifed, all ratings are removed from the analysis and each case yields one pseudovalue. No assumptions are made regarding the correlations.
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