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Field
Trial Status
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Before
in_development
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After
on_going
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Last Published
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Before
April 28, 2022 05:57 PM
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After
May 27, 2022 10:23 AM
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Primary Outcomes (End Points)
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Before
public good contribution, punishment point application, change in amount sent/returned in trust game before and after experience of oppression
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After
public good contribution, punishment application, change in amount sent/returned in trust game before and after experience of oppression
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Field
Experimental Design (Public)
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Before
The experiment has 6 different treatments based on the levels of 3 factors: Type Assignment [Random/Random_Reinforced/Earned_Reinforced] x Trust type [generalized/group specific]
The Experiment takes place over 5 parts: 1-Type Assignment, 2-Trust Game, 3-Lopsided Public Good Game, 4-Oppression Game, 5-Trust Game
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After
The experiment has 6 different treatments based on the levels of 2 factors: Type Assignment [Random/Random_Reinforced/Earned_Reinforced] x Trust type [generalized/group specific]
Following some initial piloting, we have decided to focus on just two cells of our full factorial design during our first wave of data collection. We are currently collecting data for the Random and Random_Reinforced conditions with group specific trust. After we finish data collection, we intend to revisit the remainder of our proposed to design to reconsider other factors which may be of interest.
The Experiment takes place over 5 parts: 1-Type Assignment, 2-Trust Game, 3-Lopsided Public Good Game, 4-Oppression Game, 5-Trust Game
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Planned Number of Clusters
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Before
120 clusters over 6 treatments
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After
Following some initial piloting, Our current funding covers approximately 90 clusters of 5 participants
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Planned Number of Observations
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Before
Each cluster contains 5 participants, for a total of 600 observations. Some aspects of the design involve repeated decision-making implying we will have 3000 observations of behaviour in part 3 and 6000 observations of behaviour in part 4.
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After
Each cluster contains 5 participants, for a total of 450 observations. Some aspects of the design involve repeated decision-making implying we will have 2250 observations of behaviour in part 3 and 4500 observations of behaviour in part 4. However, we are primarily interested in the punishment behaviour of Type 1/Star participants which is only observed in Part 4 and only amongst a subset of each cluster. Conditioning on this, there are a total of 2 observations of punishment over 10 rounds in each cluster implying a total of 180 observations based on our current funding.
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Sample size (or number of clusters) by treatment arms
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Before
20 clusters per treatment
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After
Following initial piloting, our goals is to get 64 observations in each of the two cells we are currently running (i.e. a total of 64 clusters & 320 participants). Once we complete data collection for the first two cells, we plan to decide which additional treatments of interest to run prior to applying for additional funding.
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Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
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After
We aim to be able to identify a medium effect size (Cohen's d=0.5) with regards to total punishment over 10 rounds. To be able to do this, our power calculation suggests that we will need 64 observations in each treatment (i.e. 32 clusters per treatment, or 160 observations per treatment). Based on our initial piloting, we estimate a pooled SD of 26 implying we would be able to detect a mean difference of 13 penalty points over ten rounds. However, our piloting also suggested a large difference in variance across groups (SD=16,36). Accounting for this, we would only be able to detect a slightly larger mean difference of approximately 14 penalty points over ten rounds.
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Field
Pi as first author
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Before
No
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After
Yes
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