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Field
Sample size (or number of clusters) by treatment arms
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Before
There are two language framing, a control framing, and randomized order of contributions or mitigation tasks. This results in 6 variations of the experiment.
At the start of data collection, each planned session will be allocated to one treatment type. However it is the underlying distribution of the of participants which matters. In the event that more sessions are needed (due to under-recruitment) new sessions will be assigned variations based on the participants still needed for a variation. If multiple types of participants are still needed assignment of the variation for a session will be randomly determined by computer. The following is a breakdown of the planned 24 sessions:
3 sessions (30 participants) will receive the dictator game first and the language focused on Oregon.
3 sessions (30 participants) will receive the contribution game first and the language focused on Oregon.
6 Sessions (60 participants) will receive the dictator game first and the control language.
6 Sessions (60 participants) will receive the contribution game first and the control language.
3 sessions (30 participants) will receive the dictator game first and the language focused on developing nations.
3 sessions (30 participants) will receive the contribution game first and the language focused on developing nations.
The spread of these treatments is designed such that there are the same number of control language treatments as the other language treatments combined (List et al 2011). In the event that there needs to be more trials due to under-enrollment during the 24 planned sessions, sessions will be added until each variation above has at least the correct number of participants. The minimum of 2 participants per session may result in some slight over allocation to a given variation.
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After
There are two language framing, a control framing, and randomized order of contributions or mitigation tasks. This results in 6 variations of the experiment.
At the start of data collection, each planned session will be allocated to one treatment type. However it is the underlying distribution of the of participants which matters. In the event that more sessions are needed (due to under-recruitment) new sessions will be assigned variations based on the participants still needed for a variation. If multiple types of participants are still needed assignment of the variation for a session will be randomly determined by computer. The following is a breakdown of the planned 24 sessions:
3 sessions (30 participants) will receive the dictator game first and the language focused on Oregon.
3 sessions (30 participants) will receive the contribution game first and the language focused on Oregon.
6 Sessions (60 participants) will receive the dictator game first and the control language.
6 Sessions (60 participants) will receive the contribution game first and the control language.
3 sessions (30 participants) will receive the dictator game first and the language focused on developing nations.
3 sessions (30 participants) will receive the contribution game first and the language focused on developing nations.
The spread of these treatments is designed such that there are the same number of control language treatments as the other language treatments combined (List et al 2011). In the event that there needs to be more trials due to under-enrollment during the 24 planned sessions, sessions will be added until each variation above has at least the correct number of participants. The minimum of 2 participants per session may result in some slight over allocation to a given variation.
Given that sessions were of different sizes, session fixed effects will be used in the analysis.
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