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Field
Last Published
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Before
December 13, 2022 11:19 PM
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After
December 17, 2022 03:49 AM
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Field
Experimental Design (Public)
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Before
We schedule 13 sessions lasting 90 minutes per session over five days. We recruit up to 30 people per session. In the beginning, participants take a quiz on the game structure (only FD and SD treatments). Next, they play a one-shot game repeatedly (20 rounds in the FD and SD treatments; 10 rounds in the DG treatments). We make ten groups of three participants for the FD and SD treatments and 15 groups of two participants for the DG treatment. After each round, we randomly reassemble the groups and randomly change the roles. Finally, they take a survey of demographics and altruistic preferences.
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After
[Fixed] We schedule 13 sessions lasting 90 minutes per session over five days. We recruit up to 33 people per session (32 people per session with the DG treatment). In the beginning, participants take a quiz on the game structure (only FD and SD treatments). Next, they play a one-shot game repeatedly (10 rounds). We make at most 11 groups of three participants for the FD and SD treatments and up to 16 groups of two participants for the DG treatment. After each round, we randomly reassemble the groups and randomly change the roles. Finally, they take a survey of demographics and altruistic preferences.
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Field
Randomization Method
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Before
We assign the DG treatment to the last session and the FD and SD treatments to the remaining 12 sessions. In a session with the FD and SD treatments, participants play one condition in the first ten rounds and another in the second ten rounds. We randomize the order of the two interventions at the session level to balance session dates and times.
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After
[Fixed] We assign the DG treatment to the last session and the FD and SD treatments to the remaining 12 sessions. We equally randomize the two interventions at the session level to balance session dates and times.
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Field
Randomization Unit
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Before
Experimental groups
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After
[Fixed] Experimental session.
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Field
Was the treatment clustered?
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Before
No
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After
Yes
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Field
Planned Number of Clusters
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Before
up to 2,550 groups
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After
[Fixed] 13 experimental sessions.
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Field
Planned Number of Observations
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Before
up to 2,550 groups
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After
[Fixed] up to 1,480 groups
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Field
Sample size (or number of clusters) by treatment arms
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Before
1. FD treatment: up to 1,200 groups
2. SD treatment: up to 1,200 groups
3. DG treatment: up to 150 groups
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After
[Fixed] 1. FD treatment: up to 660 groups (6 sessions)
[Fixed] 2. SD treatment: up to 660 groups (6 sessions)
[Fixed] 3. dictator game: up to 160 groups (1 sessions)
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
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After
[Added] Minimum detectable effect sizes are for a two-sided hypothesis test with statistical significance of 0.05 and statistical power of 0.8: 1.7 standard deviation (FD or SD vs. DG); 0.8 standard deviation (FD vs. SD). See the analysis plan in detail.
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