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Field
Last Published
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Before
December 17, 2022 03:49 AM
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After
January 09, 2023 03:32 AM
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Field
Experimental Design (Public)
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Before
[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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After
[Fixed] We schedule 9 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
[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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After
[Fixed] We assign the DG treatment to the one session and the FD and SD treatments to the remaining 8 sessions. We equally randomize the two interventions at the session level to balance session dates and times.
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Field
Planned Number of Clusters
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Before
[Fixed] 13 experimental sessions.
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After
[Fixed] 9 experimental sessions.
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Field
Planned Number of Observations
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Before
[Fixed] up to 1,480 groups
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After
[Fixed] up to 1,040 groups
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Field
Sample size (or number of clusters) by treatment arms
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Before
[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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After
[Fixed] 1. FD treatment: up to 440 groups (4 sessions)
[Fixed] 2. SD treatment: up to 440 groups (4 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
[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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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: 2.1 standard deviation (FD or SD vs. DG); 1.1 standard deviation (FD vs. SD). See the analysis plan in detail.
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