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Field
Last Published
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Before
March 19, 2024 04:54 PM
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After
March 22, 2024 09:32 AM
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Field
Planned Number of Observations
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Before
140 farmers from the region of Assis, Brazil.
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After
200 farmers from the region of Assis, Brazil.
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Field
Sample size (or number of clusters) by treatment arms
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Before
70 farmers will be assigned to the integrated treatment, and 70 to the segregated treatment.
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After
100 farmers will be assigned to the integrated treatment, and 100 to the segregated treatment.
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
Based on previous empirical results, we assume as reasonable values for the standard deviation of the main outcome variable 0.25. Considering 80% power, a 5% significance level in a two-tailed test scenario, and at least 140 participants equally allocated to each treatment, the smallest detectable effect size is estimated to be 0.0596, around 0.24 standard deviation of the outcome variable. Such an estimate is conservative, as it does not account for potential reduction in variance resulted with the inclusion of control variables.
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After
Based on previous empirical results, we assume as reasonable values for the standard deviation of the main outcome variable 0.25. Considering 80% power, a 5% significance level in a two-tailed test scenario, and at least 100 participants allocated to each treatment independently, the smallest detectable effect size is estimated to be 0.0995, around 0.4 standard deviation of the outcome variable. Such an estimate is conservative, as it does not account for potential reduction in variance resulted with the inclusion of control variables, nor the expected variance reduction in one of the treatment groups.
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