Polarization in Group Settings

Last registered on July 20, 2023
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Pre-Trial

Trial Information

General Information

Title
Polarization in Group Settings
RCT ID
AEARCTR-0011761
Initial registration date
July 17, 2023

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
July 20, 2023, 3:38 PM EDT

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

Locations

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Primary Investigator

Name
Trent McNamara
Affiliation
Abilene Christian University
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Other Primary Investigator(s)

PI Name
Roberto Mosquera
PI Affiliation
Universidad de las Americas
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Additional Trial Information

Status
In development
Start date
2023-08-01
End date
2025-12-31
Keywords
Behavior
Additional Keywords
JEL code(s)
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
Unable to disclosure prior to experiment.
External Link(s)

Registration Citation

Citation
McNamara, Trent and Roberto Mosquera. 2023. "Polarization in Group Settings." AEA RCT Registry. July 20. https://doi.org/10.1257/rct.11761-1.0
Sponsors & Partners
Experimental Details

Interventions

Intervention(s)
Unable to disclosure prior to experiment.
Intervention Start Date
2023-08-01
Intervention End Date
2025-12-31

Primary Outcomes

Primary Outcomes (end points)
donations to a public good, budget set choices
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
Unable to disclosure prior to experiment.
Experimental Design Details
Not available
Randomization Method
Randomization implemented via survey softwire (Qualtrics).
Randomization Unit
Individual-level randomization.
Was the treatment clustered?
No

Experiment Characteristics

Sample size: planned number of clusters
4800
Sample size: planned number of observations
4800
Sample size (or number of clusters) by treatment arms
200 observations per condition
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
Assuming average group contributions differ by ten between two treatments, a standard deviation of 10, and 80% power, N = 34 group observations are needed per condition. Since each group observation requires 5 participants, 170 participants are needed per condition. We estimate needing 200 for conditions that are not dichotomous in vs. out-group. Depending on statistical significance, this will be adjusted accordingly.
Supporting Documents and Materials

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IRB

Institutional Review Boards (IRBs)

IRB Name
Abilene Christian University
IRB Approval Date
2023-06-01
IRB Approval Number
IRB-2023-82
Analysis Plan

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