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Fig. 6 | Cognitive Research: Principles and Implications

Fig. 6

From: Theoretical vs. empirical discriminability: the application of ROC methods to eyewitness identification

Fig. 6

The same receiver operating characteristic (ROC) data as in Fig. 5 except that the smooth curves generated by a theoretical (signal detection) model are drawn through the ROC data points. The dashed line represents chance performance. To generate these data, d' was set to 1.4 for the simultaneous procedure and to 1.6 for the sequential procedure. The confidence criteria for the simultaneous lineup ranged from 1.5 (the overall decision criterion, c1) to 2.5 (the high-confidence decision criterion, c5). The corresponding confidence criteria for the sequential lineup ranged from 2.0 to 3.0, which captures the widely held view that sequential lineups induce more conservative responding than simultaneous lineups. Finally, criterion variance (Ļƒ C ) was set to 0 for the simultaneous lineup and to 0.75 for the sequential lineup, which is why the sequential lineup, despite its higher d', yields a lower ROC than the simultaneous lineup

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