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Field
Trial End Date
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Before
April 30, 2024
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After
June 30, 2024
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Field
Last Published
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Before
March 30, 2023 03:32 PM
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After
March 08, 2024 03:02 PM
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Field
Intervention End Date
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Before
April 30, 2023
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After
June 15, 2024
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Field
Experimental Design (Public)
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Before
A baseline survey will take place from February to March 2023, right after the cocoa main harvest season. The interventions (described in the Intervention section) using a lab-in-the-field design will be rolled out in March - May 2023. Data collection on the GPS coordinates of shade trees on each farmer's plots will be conducted separately pending logistics details. A follow-up survey is planned. We will track attrition along the process and use Lee bounds if attrition is imbalanced across treatment groups.
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After
Baseline surveys took place from February to March 2023 in Nkawkaw and from February to March 2024 for Sefwi Bekwai, right after the cocoa main harvest season. The interventions (described in the Intervention section) using a lab-in-the-field design were rolled out in March to May 2023 in Nkawkaw and will be rolled out in March - April 2024 in Sefwi Bekwai. Fewer days are scheduled for Sefwi Bekwai due to a smaller sample size compared to Nkawkaw.
Data collection on the GPS coordinates of shade trees on each farmer's plots will be conducted separately pending logistics details. A follow-up survey is planned. We will track attrition along the process and use Lee bounds if attrition is imbalanced across treatment groups.
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Field
Randomization Unit
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Before
At the farmer level. We stratify the sample by (1) gender, (2) age greater than or equal to 55, (3) land size greater than or equal to 5 acres, and (4) 21 communities. This leads to 133 strata, as the strata with fewer than 6 farmers are dropped.
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After
At the farmer level. We stratify the sample by (1) gender, (2) age greater than or equal to 55, (3) land size greater than or equal to 5 acres, and (4) community (20 communities in Nkawkaw and 10 communities in Sefwi Bekwai). This leads to 133 strata in Nkawkaw after dropping strata with fewer than 6 farmers; There are 80 strata in Sefwi Bekwai and the strata with fewer than 6 farmers are kept and randomly assigned to each treatment arm, in order to maintain a reasonable sample size.
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Field
Planned Number of Clusters
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Before
1627 farmers
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After
1627 farmers in Nkawkaw and 744 farmers in Sefwi Bekwai
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Field
Planned Number of Observations
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Before
2 observations per farmer, 3254 observations at the land level in total
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After
2 observations per farmer, which leads to 3254 observations at the land level in total for Nkawkaw, and 1488 observations for Sefwi Bekwai
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Field
Sample size (or number of clusters) by treatment arms
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Before
T1: Standard PES only: 266 farmers
T2: Variable PES only: 274 farmers
T3: Market-based PES only: 277 farmers
T4: Variable PES + Information: 273 farmers
T5: Market-based PES + Information: 269 farmers
Control: 268 farmers
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After
T1: Standard PES only: 390 farmers (266 from Nkawkaw, 124 from Sefwi Bekwai)
T2: Variable PES only: 392 farmers (274 from Nkawkaw, 118 from Sefwi Bekwai)
T3: Market-based PES only: 403 farmers (277 from Nkawkaw, 126 from Sefwi Bekwai)
T4: Variable PES + Information: 393 farmers (273 from Nkawkaw, 120 from Sefwi Bekwai)
T5: Market-based PES + Information: 401 farmers (269 from Nkawkaw, 132 from Sefwi Bekwai)
Control: 390 farmers (268 from Nkawkaw, 122 from Sefwi Bekwai)
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