Opting out of treatment: Self-selection bias in a randomized controlled study of...
source link: https://link.springer.com/article/10.1007/s11292-017-9309-z
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Abstract
Objectives
This study investigated the role of self-selection in an evaluation of the impact of a focused deterrence notification meeting on subsequent arrests.
Methods
We conducted a randomized controlled study that randomly assigned probationers and parolees to a treatment group asked to attend a focused deterrence notification meeting and a control group that was not asked to attend the meeting. A sizable proportion of the treatment group did not attend the meeting. We estimated intent-to-treat, average treatment, and local average treatment models to evaluate the effect of attending the notification meeting on future arrests and the effect of self-selection on the results.
Results
Subjects who attended the notification meeting were less likely than those who did not receive treatment to be arrested over the following 17 months. The results were not significantly affected by selection effects.
Conclusions
Future evaluations of focused deterrence and related criminal justice interventions should be based on randomized controlled research designs that address selection effects on the outcome.
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