AEA RCT Registry

Fields Changed

Registration

Field	Before	After
Trial Start Date	April 20, 2020	April 21, 2020
Last Published	April 17, 2020 03:27 PM	April 21, 2020 06:58 PM
Intervention (Public)	We devised materials for a Facebook/Instagram (FB) advertising campaign and an associated website. These provide readers with instructions for making reports to police via the Silent Solution, an approach that allows callers to make reports with little if any speaking. To test the effectiveness of the campaign, we will identify a group of high-risk potential DA victims based on their previous victimization history. We will randomly assign half of this high-risk pool to treatment and half to control. Those in the treatment condition will be targeted for the ad campaign via FB.	We devised materials for a Facebook/Instagram (FB) advertising campaign and an associated website. These provide readers with instructions for making reports to police via the Silent Solution, an approach that allows callers to make reports with little if any speaking. To test the effectiveness of the campaign, we will identify a group of postal sectors with high numbers of domestic abuse incidents. They will be randomized into three groups: control, Silent Solution treatment, and alternative treatment TBD. Those in the Silent Solution condition will be targeted for the ad campaign via FB. Pending discussions with MPS, we hope to launch a second treatment condition within a few weeks of the first. That condition would involve a similar FB campaign directing readers to a second alternative means of reaching police.
Intervention Start Date	April 20, 2020	April 21, 2020
Intervention End Date	May 05, 2020	June 21, 2020
Experimental Design (Public)	Our main analysis will be based on the RCT, which involves assigning half of the postal sectors in high-risk areas to treatment and half to control. We will use a conditional RCT design to identify the intent-to-treat effect of the ad campaign on contemporary calls for service and calls for service by type. We will also use a conditional RCT design to measure the ITT of the ad campaign on recidivism. Depending on the strength of the first stage, we may also use an IV strategy to estimate how calls for service during quarantine affect recidivism.	Our main analysis will be based on the RCT, which involves assigning one-third of the postal sectors in high-risk areas to the Silent Solution treatment condition and one-third to control. We will use a conditional RCT design to identify the intent-to-treat effect of the ad campaign on contemporary calls for service and calls for service by type. We will also use a conditional RCT design to measure the ITT of the ad campaign on recidivism. Depending on the strength of the first stage, we may also use an IV strategy to estimate how calls for service during quarantine affect recidivism. If we are successful in launching a second treatment condition (for which one-third of the postal sectors will be reserved), we will carry out similar analyses of its effects.
Randomization Unit	Postal sector/district	Postal sector
Planned Number of Clusters	TBD	NA
Planned Number of Observations	TBD	524 postal sectors
Sample size (or number of clusters) by treatment arms	TBD	175 sectors each to Silent Solution and control; 174 sectors reserved for second treatment condition.