Calibrating the witness's willingness to intervene in violence against women.

Last registered on July 20, 2023


Trial Information

General Information

Calibrating the witness's willingness to intervene in violence against women.
Initial registration date
November 14, 2022

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
November 18, 2022, 11:18 AM EST

First published corresponds to when the trial was first made public on the Registry after being reviewed.

Last updated
July 20, 2023, 12:07 PM EDT

Last updated is the most recent time when changes to the trial's registration were published.



Primary Investigator

Universidad Publica de Navarra

Other Primary Investigator(s)

PI Affiliation
Universidad Publica de Navarra
PI Affiliation
PI Affiliation

Additional Trial Information

Start date
End date
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
The purpose of this pilot is to calibrate the willingness to intervene of witnesses of violence against women, by means of an incentivized survey experiment. The information obtained will be used to design a subsequent survey experiment. The pilot will also be used to assess the set of questions included in the survey.
External Link(s)

Registration Citation

Echavarri, Rebeca et al. 2023. "Calibrating the witness's willingness to intervene in violence against women.." AEA RCT Registry. July 20.
Sponsors & Partners

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Experimental Details


Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Willingness to intervene assuming different cost levels.
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Participants' preferences, personality traits, cultural values, ability to identify violence against women, and socio-demographic characteristics.
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Participants will read a realistic and well-explained scenario of violence against women (a vignette) and, given this
context, will choose whether to intervene or not. Half of participants will have the option to intervene by denouncing the aggressor to the police (Treatment 1: punishing the aggressor), and the other half will have option to the intervene by reporting the abuse to social services (Treatment 2: helping the victim).
Each participant receives an initial endowment. Participants who choose to intervene will give up part of the endowment in favor of a well-recognised NGO created to strengthen the laws that punish VAW aggressors and to help victims of VAW. Those who decide not to intervene will keep the total endowment for themselves. Each participant will take the same decision nine times in which the part of their endowment they give up is increasing (for half of participants) or decreasing (for the other half).
Experimental Design Details
Randomization Method
Randomization done in office by a computer.
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
120 individuals.
Sample size: planned number of observations
120 individuals.
Sample size (or number of clusters) by treatment arms
Treatment 1: 60 individuals.
Treatment 2: 60 individuals.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Ethics Committee of the Universidad Publica de Navarra
IRB Approval Date
IRB Approval Number


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Intervention Completion Date
January 25, 2023, 12:00 +00:00
Data Collection Complete
Data Collection Completion Date
January 25, 2023, 12:00 +00:00
Final Sample Size: Number of Clusters (Unit of Randomization)
Was attrition correlated with treatment status?
Final Sample Size: Total Number of Observations
122 individuals
Final Sample Size (or Number of Clusters) by Treatment Arms
61 individuals in hard-reporting group and 61 individuals in soft-reporting group
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials