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Field
Power calculation: Minimum Detectable Effect Size for Main Outcomes
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Before
Based on a conservative power calculation, a sample size of 1000 households will be used in this study with 500 household being assigned to the treatments (250 in T1 - multi-storey gardens and 250 in T2 - BSFFF) and 500 households being assigned to the control group. The power calculation assumes a 5 percent level of statistical significance and a statistical power of 80 percent. The power calculation further assumes a monthly per adult equivalent food expenditure of KShs. 5705. This benchmark value for the outcome indicator is from the 2015/16 Kenya Integrated Household Budget Survey. This sample size will enable the study to detect a minimum of KShs.1000 ($10) increase in monthly per adult equivalent food expenditure.
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After
Based on a conservative power calculation, a sample size of 900 households will be used in this study with 600 household being assigned to the treatments (300 in T1 - multi-storey gardens and 300 in T2 - BSFFF) and 300 households being assigned to the control group. The power calculation assumes a 5 percent level of statistical significance and a statistical power of 80 percent. The power calculation further assumes a monthly per adult equivalent food expenditure of KShs. 5705. This benchmark value for the outcome indicator is from the 2015/16 Kenya Integrated Household Budget Survey. This sample size will enable the study to detect a minimum of KShs.1500 ($12) increase in monthly per adult equivalent food expenditure.
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