Comparison of Mediation Procedures

Last registered on June 15, 2022

Pre-Trial

Trial Information

General Information

Title
Comparison of Mediation Procedures
RCT ID
AEARCTR-0009434
Initial registration date
June 13, 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
June 15, 2022, 10:16 AM 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

Affiliation

Other Primary Investigator(s)

PI Affiliation
University of Zurich

Additional Trial Information

Status
In development
Start date
2022-06-16
End date
2022-08-31
Secondary IDs
Prior work
This trial does not extend or rely on any prior RCTs.
Abstract
This preregistration describes a laboratory experiment to be conducted at the University of Zurich. The experiment investigates the welfare impact of two mediation procedures.
External Link(s)

Registration Citation

Citation
Alos-Ferrer, Carlos and Carlos Alos-Ferrer. 2022. "Comparison of Mediation Procedures." AEA RCT Registry. June 15. https://doi.org/10.1257/rct.9434
Experimental Details

Interventions

Intervention(s)
Intervention Start Date
2022-06-16
Intervention End Date
2022-08-31

Primary Outcomes

Primary Outcomes (end points)
- Proportion of Subgame Perfect Outcomes.
- Proportion of Outcomes belonging to the Unanimity Compromise Set.
- Fairness of the outcome.
Primary Outcomes (explanation)
Fairness of the outcome is measured as the minimum across both players in a game of the number of options that are strictly worse than the outcome, according to the individual (payoff-induced) preferences.

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
This preregistration describes a laboratory experiment to be conducted at the University of Zurich. The experiment investigates the welfare impact of two mediation procedures.
Experimental Design Details
Not available
Randomization Method
Randomization done by computer.
Randomization Unit
Random groups of 4 participants.
Was the treatment clustered?
Yes

Experiment Characteristics

Sample size: planned number of clusters
134 groups (of 4 participants).
Sample size: planned number of observations
536 participants
Sample size (or number of clusters) by treatment arms
67 groups
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
The sample size ensures at least enough power (0.8) to find a medium effect size (0.5) for our hypotheses, using non-parametric, between-subject rank-sum tests (Mann-Whitney-Wilcoxon)
Supporting Documents and Materials

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IRB

Institutional Review Boards (IRBs)

IRB Name
Human Subjects Committee of the Faculty of Economics, Business Administration, and Information Technology, University of Zurich
IRB Approval Date
2022-04-28
IRB Approval Number
OEC IRB # 2022-036