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Field
Last Published
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Before
March 17, 2023 11:01 AM
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After
March 22, 2023 03:13 PM
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Field
Planned Number of Clusters
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Before
100 enumeration areas
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After
150 enumeration areas including 5-10 households
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Field
Sample size (or number of clusters) by treatment arms
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Before
50 enumeration areas control, 50 enumeration areas multi-storey gardens, 25 enumeration areas both treatment
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After
50 enumeration areas control, 50 enumeration areas with multi-storey gardens only and 50 enumeration areas with multi-storey gardens and frass fertilizer.
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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 treatment group (500 in T1 - multi-storey gardents 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 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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