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Eyes in the sky, boots on the ground : assessing satellite- and ground-based approaches to crop yield measurement and analysis in Uganda (English)

Crop yields in smallholder systems are traditionally assessed using farmer-reported information in surveys, occasionally by crop cuts for a sub-section of a farmer's plot, and rarely using full-plot harvests. ... See More +

Policy Research Working Paper WPS8374 MAR 26, 2018

Lobell,David B.; Azzari,George; Marshall,Burke; Gourlay,Sydney; Jin,Zhenong; Kilic,Talip; Murray,Siobhan Disclosed

Land Tenure Module : Essential Questions for Data Collection for 1.4.2 and 5.a.1 (English)

Five modules with essential questions to collect data required for measuring SDG indicators 1.4.2 and 5.a.1 , based on the meta data as approved by the Inter Agency Expert Group on SDGs. ... See More +

Working Paper 119717 SEP 13, 2017

Gourlay,Sydney; Ali,Daniel Ayalew; Brunelli,Chiara; Deininger,Klaus W.; Hilhorst,Dorothea Huberta Maria; Kilic,Talip; Nairesiae,Everlyne; Zezza,Alberto Disclosed

Could the debate be over ? errors in farmer-reported production and their implications for the inverse scale-productivity relationship in Uganda (English)

Based on a two-round household panel survey conducted in Eastern Uganda, this study shows that the analysis of the inverse scale-productivity relationship is highly sensitive to how plot-level maize production, hence yield (production divided by GPS-based plot area), is measured. ... See More +

Policy Research Working Paper WPS8192 SEP 12, 2017

Gourlay,Sydney; Kilic,Talip; Lobell,David Disclosed

Collecting the dirt on soils : advancements in plot-level soil testing and implications for agricultural statistics (English)

Much of the current analysis on agricultural productivity is hampered by the lack of consistent, high quality data on soil health and how it is changing under past and current management. ... See More +

Policy Research Working Paper WPS8057 MAY 11, 2017

Gourlay,Sydney; Aynekulu,Ermias; Shepherd,Keith; Carletto,Calogero Disclosed

Cheaper, faster, and more than good enough : is GPS the new gold standard in land area measurement ? (English)

In rural societies of low- and middle-income countries, land is a major measure of wealth, a critical input in agricultural production, and a key variable for assessing agricultural performance and productivity. ... See More +

Policy Research Working Paper WPS7759 JUL 21, 2016

Carletto,Calogero; Gourlay,Sydney; Murray,Siobhan; Zezza,Alberto Disclosed

Land measurement bias and its empirical implications : evidence from a validation exercise (English)

This paper investigates how land size measurements vary across three common land measurement methods (farmer estimated, Global Positioning System (GPS), and compass and rope), and the effect of land size measurement error on the inverse farm size relationship and input demand functions. ... See More +

Policy Research Working Paper WPS7597 MAR 14, 2016

Dillon,Andrew S.; Gourlay,Sydney; Mcgee,Kevin Robert; Oseni,Gbemisola O. Disclosed

From guesstimates to GPStimates : land area measurement and implications for agricultural analysis (English)

Land area measurement is a fundamental component of agricultural statistics and analysis. Yet, commonly employed self-reported land area measures used in most analysis are not only potentially measured with error, but these errors may be correlated with agricultural outcomes. ... See More +

Policy Research Working Paper WPS6550 JUL 01, 2013

Carletto, Calogero; Gourlay, Sydney; Winters, Paul Disclosed