Computes Tredoux's small-cell corrected diagnosticity ratio for one target-present/target-absent lineup pair.
Arguments
- lineup_pres
A numeric vector of lineup choices for a lineup in which the target was present
- lineup_abs
A numeric vector of lineup choices for a lineup in which the target was absent
- pos_pres
A scalar, representing target position in TP lineup. Must be declared by user
- pos_abs
A scalar, representing target position in TA lineup. Must be declared by user
- k1
Number of targets in TP lineup. Must be specified by user (scalar).
- k2
Number of targets in TA lineup. Must be specified by user (scalar).
Details
The corrected estimator is: $$DR_T = \frac{(n_{TP,s} + 0.5)/(N_{TP} + 0.5)} {(n_{TA,s} + 0.5)/(N_{TA} + 0.5)},$$ where \(n_{TP,s}\) and \(n_{TA,s}\) are suspect-selection counts in target-present and target-absent lineups, respectively, and \(N_{TP}\) and \(N_{TA}\) are the corresponding sample sizes.
References
Malpass, R. S. (1981). Effective size and defendant bias in eyewitness identification lineups. Law and Human Behavior, 5(4), 299-309.
Malpass, R. S., Tredoux, C., & McQuiston-Surrett, D. (2007). Lineup construction and lineup fairness. In R. Lindsay, D. F. Ross, J. D. Read, & M. P. Toglia (Eds.), Handbook of Eyewitness Psychology, Vol. 2: Memory for people (pp. 155-178). Mahwah, NJ: Lawrence Erlbaum Associates.
Tredoux, C. G. (1998). Statistical inference on measures of lineup fairness. Law and Human Behavior, 22(2), 217-237.
Tredoux, C. (1999). Statistical considerations when determining measures of lineup size and lineup bias. Applied Cognitive Psychology, 13, S9-S26.
Wells, G. L.,Leippe, M. R., & Ostrom, T. M. (1979). Guidelines for empirically assessing the fairness of a lineup. Law and Human Behavior, 3(4), 285-293.