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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
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After
Sample size of each group should be more than or equal to316.
<Explanation>
According to the prior research (Ohtake et al. 2020), the rates of having intention to evacuate to evacuation sites are 0.232 in control group and 0.357 in one of the treatment group which has exactly a same intervention that we use in this survey. Also, we can get standard deviation from prior research. In addition, we set power = 0.8 and significance level = 0.05 and there are four groups which consist of a one control group and three treatment groups.
From these settings, we calculate sample size we need by using R package "TrialSize" and function "OneWayANOVA.PairwiseComparison".
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