Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys
To document the relative accuracy of methods for microdata collection on root and tuber crop production, an experiment was implemented in Malawi over a 12-month period, randomly assigning cassava-producing households to one of four approaches: dail...
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| Format: | Working Paper |
| Language: | English |
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World Bank, Washington, DC
2018
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| Online Access: | http://documents.worldbank.org/curated/en/393581539866711478/Root-for-the-Tubers-Extended-Harvest-Crop-Production-and-Productivity-Measurement-in-Surveys http://hdl.handle.net/10986/30600 |
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okr-10986-306002021-11-10T12:19:13Z Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys Kilic, Talip Moylan, Heather Ilukor, John Mtengula, Clement Pangapanga-Phiri, Innocent CROP PRODUCTION CASSAVA ROOT CROPS TUBER CROPS YIELD HARVEST DIARIES HOUSEHOLD SURVEYS AGRICULTURAL PRODUCTIVITY PRODUCTIVITY MEASUREMENT To document the relative accuracy of methods for microdata collection on root and tuber crop production, an experiment was implemented in Malawi over a 12-month period, randomly assigning cassava-producing households to one of four approaches: daily diary-keeping, with semi-weekly supervision visits; daily diary-keeping, with semi-weekly supervisory phone calls; two six-month recall interviews, with six months in between; and a single 12-month recall interview. Lapses in diary-keeping can underestimate true production, albeit to a lesser degree compared to recall. And the comparisons between the diary variants and the variation in underestimation by recall period are unclear ex ante. The analysis reveals that compared to traditional diary-keeping, the household-level annual cassava production is 295 kilograms higher, on average, (and assumed as closer to the truth) under diary-keeping with phone calls. This effect corresponds to 28 percent of the average traditional diary-keeping production estimate. Although the difference between the estimates based on six-month recall and traditional diary-keeping is statistically insignificant, 12-month recall underestimates annual production, on average, by 516 kilograms and 221 kilograms, respectively, compared to diary-keeping with phone calls and traditional diary-keeping. While the recall-based approaches both underestimate true production, six-month recall does so to a lesser extent. The evidence additionally demonstrates likely gross overestimation in international and ministerial statistics on cassava yields in Malawi. For improved microdata on root and tuber crop production, the adoption of (i) diary-keeping with phone calls (particularly if deployed in a broader mobile phone–based survey) or (ii) six-month recall, as a second-best alternative, is recommended. 2018-10-24T17:12:26Z 2018-10-24T17:12:26Z 2018-10 Working Paper http://documents.worldbank.org/curated/en/393581539866711478/Root-for-the-Tubers-Extended-Harvest-Crop-Production-and-Productivity-Measurement-in-Surveys http://hdl.handle.net/10986/30600 English Policy Research Working Paper;No. 8618 CC BY 3.0 IGO http://creativecommons.org/licenses/by/3.0/igo World Bank World Bank, Washington, DC Publications & Research Publications & Research :: Policy Research Working Paper Africa Sub-Saharan Africa Malawi |
| repository_type |
Digital Repository |
| institution_category |
Foreign Institution |
| institution |
Digital Repositories |
| building |
World Bank Open Knowledge Repository |
| collection |
World Bank |
| language |
English |
| topic |
CROP PRODUCTION CASSAVA ROOT CROPS TUBER CROPS YIELD HARVEST DIARIES HOUSEHOLD SURVEYS AGRICULTURAL PRODUCTIVITY PRODUCTIVITY MEASUREMENT |
| spellingShingle |
CROP PRODUCTION CASSAVA ROOT CROPS TUBER CROPS YIELD HARVEST DIARIES HOUSEHOLD SURVEYS AGRICULTURAL PRODUCTIVITY PRODUCTIVITY MEASUREMENT Kilic, Talip Moylan, Heather Ilukor, John Mtengula, Clement Pangapanga-Phiri, Innocent Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| geographic_facet |
Africa Sub-Saharan Africa Malawi |
| relation |
Policy Research Working Paper;No. 8618 |
| description |
To document the relative accuracy of
methods for microdata collection on root and tuber crop
production, an experiment was implemented in Malawi over a
12-month period, randomly assigning cassava-producing
households to one of four approaches: daily diary-keeping,
with semi-weekly supervision visits; daily diary-keeping,
with semi-weekly supervisory phone calls; two six-month
recall interviews, with six months in between; and a single
12-month recall interview. Lapses in diary-keeping can
underestimate true production, albeit to a lesser degree
compared to recall. And the comparisons between the diary
variants and the variation in underestimation by recall
period are unclear ex ante. The analysis reveals that
compared to traditional diary-keeping, the household-level
annual cassava production is 295 kilograms higher, on
average, (and assumed as closer to the truth) under
diary-keeping with phone calls. This effect corresponds to
28 percent of the average traditional diary-keeping
production estimate. Although the difference between the
estimates based on six-month recall and traditional
diary-keeping is statistically insignificant, 12-month
recall underestimates annual production, on average, by 516
kilograms and 221 kilograms, respectively, compared to
diary-keeping with phone calls and traditional
diary-keeping. While the recall-based approaches both
underestimate true production, six-month recall does so to a
lesser extent. The evidence additionally demonstrates likely
gross overestimation in international and ministerial
statistics on cassava yields in Malawi. For improved
microdata on root and tuber crop production, the adoption of
(i) diary-keeping with phone calls (particularly if deployed
in a broader mobile phone–based survey) or (ii) six-month
recall, as a second-best alternative, is recommended. |
| format |
Working Paper |
| author |
Kilic, Talip Moylan, Heather Ilukor, John Mtengula, Clement Pangapanga-Phiri, Innocent |
| author_facet |
Kilic, Talip Moylan, Heather Ilukor, John Mtengula, Clement Pangapanga-Phiri, Innocent |
| author_sort |
Kilic, Talip |
| title |
Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| title_short |
Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| title_full |
Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| title_fullStr |
Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| title_full_unstemmed |
Root for the Tubers : Extended-Harvest Crop Production and Productivity Measurement in Surveys |
| title_sort |
root for the tubers : extended-harvest crop production and productivity measurement in surveys |
| publisher |
World Bank, Washington, DC |
| publishDate |
2018 |
| url |
http://documents.worldbank.org/curated/en/393581539866711478/Root-for-the-Tubers-Extended-Harvest-Crop-Production-and-Productivity-Measurement-in-Surveys http://hdl.handle.net/10986/30600 |
| _version_ |
1764472466035441664 |