Fig. 5

Hypothetical receiver operating characteristic (ROC) curves for two eyewitness identification procedures in which a 5-point confidence scale was used. The rightmost ROC point again represents the overall correct and false positive identification (ID) rates that are ordinarily used to compute the diagnosticity ratio. Note that the diagnosticity ratio for the rightmost point is higher for the sequential procedure, a result that, in the past, would have been interpreted to mean that the sequential procedure is diagnostically superior to the simultaneous procedure. The region shaded dark gray represents the partial area under the curve (pAUC) for the sequential procedure in the specified false ID rate range of 0 to FAR _max . That dark gray region plus the light gray region above it represents the pAUC for the simultaneous procedure over the same false ID rate range. The dashed line represents the line of chance performance