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Last Published
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Before
January 24, 2024 05:39 PM
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After
March 04, 2024 09:52 AM
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Planned Number of Clusters
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Before
350
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After
350 (IRB approved number)
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Planned Number of Observations
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Before
350
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After
200-350 (based on power calculations up to max number of observations currently approved by IRB)
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Sample size (or number of clusters) by treatment arms
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Before
required power calculation per treatment is 64 for a medium (d=0.8) effect size
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After
The required power calculation per treatment is 64 for a medium (d=0.5) effect size. This calculation is based off of two previous studies. Ariely et. al reports a power of 0.95 and an effect size of 0.84 where n=20 per treatment arm. Based on their effect size we calculated a required sample of 31 per treatment arm for our pilot. The results of this pilot found an effect size of 0.30.
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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
d=0.8
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After
d=0.5
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