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Common Knowledge in Coordination Games
Last registered on September 01, 2017

Pre-Trial

Trial Information
General Information
Title
Common Knowledge in Coordination Games
RCT ID
AEARCTR-0002406
Initial registration date
August 30, 2017
Last updated
September 01, 2017 9:55 AM EDT
Location(s)
Region
Primary Investigator
Affiliation
University of Michigan
Other Primary Investigator(s)
PI Affiliation
Nanyang Technological University
PI Affiliation
National University of Singapore
Additional Trial Information
Status
In development
Start date
2017-09-04
End date
2018-05-31
Secondary IDs
Abstract
In the replication study of Camerer et al. (2016), Chen and Chen (2011) did not replicate. In this study, we seek to understand reasons which might have led to the non-replication. One protocol deviation in the replication was that the replication author did not read the instructions for the coordination game aloud, thus removing the common knowledge condition from the minimum effort coordination game. We conjecture that common knowledge is critical to establish efficient coordination with ingroup members. In a series of laboratory experiments, we vary the experimental condition by conducting two treatments with and two without common knowledge.
External Link(s)
Registration Citation
Citation
Chen, Roy, Yan Chen and Yohanes Riyanto. 2017. "Common Knowledge in Coordination Games." AEA RCT Registry. September 01. https://doi.org/10.1257/rct.2406-1.0.
Former Citation
Chen, Roy, Yan Chen and Yohanes Riyanto. 2017. "Common Knowledge in Coordination Games." AEA RCT Registry. September 01. https://www.socialscienceregistry.org/trials/2406/history/21080.
Experimental Details
Interventions
Intervention(s)
To test the effects of common knowledge in coordination games, we employ a 2*2 between-subject factorial design. Along one dimension, we vary whether we establish common knowledge by reading the instructions for the minimum effort game aloud. Along the other dimension, we implement the original ingroup versus outgroup treatments.
Intervention Start Date
2017-09-04
Intervention End Date
2018-05-01
Primary Outcomes
Primary Outcomes (end points)
effort level; communication quantity in the chat stage;
Primary Outcomes (explanation)
Secondary Outcomes
Secondary Outcomes (end points)
Secondary Outcomes (explanation)
Experimental Design
Experimental Design
To test the effects of common knowledge in coordination games, we employ a 2*2 between-subject factorial design. Along one dimension, we vary whether we establish common knowledge by reading the instructions for the minimum effort game aloud. Along the other dimension, we implement the original ingroup versus outgroup treatments.

Since each session consists of 12 subjects, we use 168 subjects, or 14 independent sessions to replicate the original study.

We also run an identical number of sessions following the replication protocol, i.e., without the common knowledge.
Experimental Design Details
Randomization Method
Randomization done in office by a computer.
Randomization Unit
Each subject is randomized into one of two sessions. Sessions are randomized into one of four different treatments.
Was the treatment clustered?
Yes
Experiment Characteristics
Sample size: planned number of clusters
28 sessions, 7 per treatment.
Sample size: planned number of observations
336 subjects
Sample size (or number of clusters) by treatment arms
72 students per treatment.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)
We will use 90% power, p=0.033. See pdf for details.
Supporting Documents and Materials

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Request Information
IRB
INSTITUTIONAL REVIEW BOARDS (IRBs)
IRB Name
the National University of Singapore IRB
IRB Approval Date
2016-05-13
IRB Approval Number
Ref. Code A-16-150E
Analysis Plan

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Post-Trial
Post Trial Information
Study Withdrawal
Intervention
Is the intervention completed?
No
Is data collection complete?
Data Publication
Data Publication
Is public data available?
No
Program Files
Program Files
Reports and Papers
Preliminary Reports
Relevant Papers