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Field
Planned Number of Observations
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Before
In all treatments, subjects interact in groups of 4. Each group of 4 generates an independent observation.
We plan for 12 groups (48 subjects) per treatment. As treatments 1A,1B,3A,3B are subgrouped into groups with high and low costs, we plan to generate the double amount, i.e. 24 groups (96 subjects). Generating a total of 624 subjects.
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After
In all treatments, subjects interact in groups of 4. Each group of 4 generates an independent
observation. We once run the experiment with a smaller cost heterogeneity (0.7 vs. 1.3) and once with a bigger cost heterogeneity (0.6 vs. 1.8).
For the first round of sessions with the smaller cost heterogeneity we plan for 12 groups (48 subjects) per treatment. As treatments 1A,1B,3A,3B are subgrouped into groups with high and low costs, we plan to generate the double amount, i.e. 24 groups (96 subjects). Generating a total of 624 subjects. These sessions are run in November and December 2021.
For the second round of sessions with the bigger cost heterogeneity we plan for 15 groups (60 subjects) per treatment. Corresponding to before, we take the treatments 1A, 1B, 3A, 3B double, i.e. 30 groups (120 subjects), which generates a total of 780 required subjects. These sessions are run in February and March 2022.
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