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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
From our pilots (with limit sample size), we estimate the mean WTP in the control group to lie between 0.13 and 0.2. The SD of the WTP is estimated to lie between 0.24 and 0.3. Assuming a maximum sample size of 500 workers and symmetric treatment groups and based on a two-means test, we estimate the minimum detectable effect size from a linear model for the WTP to be about 0.07 Euro.
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After
From our pilots (with limit sample size), we estimate the SD of the WTP in the control group to be around 0.1. Assuming a maximum sample size of 500 workers and symmetric treatment groups and based on a two-means test, we estimate the minimum detectable effect size from a linear model for the WTP (unit: Euro) to be about 50% of the control group mean.
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