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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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Field
Last Published
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Before
May 13, 2024 12:46 PM
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After
August 16, 2024 11:21 AM
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Field
Planned Number of Clusters
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Before
3000 individuals
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After
4500 individuals
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Field
Planned Number of Observations
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Before
3000 individuals
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After
4500 individuals
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Field
Sample size (or number of clusters) by treatment arms
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Before
1500 individuals control app; 1500 individuals treatment app
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After
2250 individuals control app; 2250 individuals treatment app
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
With an intended sample size of 3000 individuals and 80% power, we will have an MDE for consumption (carbon footprint) on the order of 0.04 log points. In pilot data, the mean for ln(carbon footprint + 1) is 4.14 and the standard deviation for this outcome is 1.37 log points, so our MDE is roughly 3% of a standard deviation.
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After
With a sample size of 4000 individuals and 80% power, we will have an MDE for consumption (carbon footprint) on the order of 0.04 log points. In pilot data, the mean for ln(carbon footprint + 1) is 4.14 and the standard deviation for this outcome is 1.37 log points, so our MDE is roughly 3% of a standard deviation.
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