Compute Innocent Suspect ID Rate with Nominal Size Correction

Estimates innocent-suspect identification rate using nominal lineup size, assuming all lineup members are equally plausible (perfectly fair lineup).

Usage

innocent_id_rate_nominal(error_rate, lineup_size)

Arguments

error_rate

Numeric. Overall mistaken identification rate from culprit-absent lineups.

lineup_size

Integer. Nominal number of people in the lineup.

Value

Numeric. Estimated innocent-suspect identification rate.

Details

This represents the "best case" estimate assuming perfect lineup fairness. The formula is: innocent_id_rate = error_rate / lineup_size

References

Fitzgerald, R. J., Tredoux, C. G., & Juncu, S. (2023). Estimation of eyewitness error rates in fair and biased lineups. Law and Human Behavior.

Examples

# 30% mistaken ID rate in a fair 6-person lineup
innocent_id_rate_nominal(0.30, 6)
#> [1] 0.05