From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis

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...

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Main Authors:	Carletto, Calogero, Gourlay, Sydney, Winters, Paul
Format:	Policy Research Working Paper
Language:	English en_US
Published:	World Bank, Washington, DC 2013
Subjects:	AGRICULTURAL DEVELOPMENT AGRICULTURAL INFORMATION AGRICULTURAL INNOVATION AGRICULTURAL PRODUCTION AGRICULTURE CONSTANT RETURNS TO SCALE COUNTRY CASE STUDIES CROPS DATA COLLECTION DEVELOPMENT ECONOMICS DEVELOPMENT POLICY DEVELOPMENT RESEARCH DRIVING ECONOMETRIC ANALYSIS ECONOMETRICS ECONOMICS ELASTICITY EQUATIONS EQUIPMENT FARMERS FARMS FIELD EXPERIMENTS GENDER GLOBAL POSITIONING SYSTEM GLOBAL POSITIONING SYSTEMS GPS INNOVATION LIVING STANDARDS survey design land measurement inverse productivity relationship
Online Access:	http://documents.worldbank.org/curated/en/2013/07/18055670/guesstimates-gpstimates-land-area-measurement-implications-agricultural-analysis http://hdl.handle.net/10986/15910

id	okr-10986-15910
recordtype	oai_dc
spelling	okr-10986-159102021-04-23T14:03:26Z From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis Carletto, Calogero Gourlay, Sydney Winters, Paul AGRICULTURAL DEVELOPMENT AGRICULTURAL INFORMATION AGRICULTURAL INNOVATION AGRICULTURAL PRODUCTION AGRICULTURE CONSTANT RETURNS TO SCALE COUNTRY CASE STUDIES CROPS DATA COLLECTION DEVELOPMENT ECONOMICS DEVELOPMENT POLICY DEVELOPMENT RESEARCH DRIVING ECONOMETRIC ANALYSIS ECONOMETRICS ECONOMICS ELASTICITY EQUATIONS EQUIPMENT FARMERS FARMS FIELD EXPERIMENTS GENDER GLOBAL POSITIONING SYSTEM GLOBAL POSITIONING SYSTEMS GPS INNOVATION LIVING STANDARDS survey design land measurement inverse productivity relationship 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. Measures employing Global Positioning Systems, on the other hand, while not perfect especially on smaller plots, are likely to provide more precise measures and errors less correlated with agricultural outcomes. This paper uses data from four African countries to compare the use of self-reported and Global Positioning Systems land measures to (1) examine the differences between the measures, (2) identify the sources of the differences, and (3) assess the implications of the different measures on agricultural analysis focusing on the inverse productivity relationship. The results indicate that self-reported land areas systematically differ from Global Positioning Systems land measures and that this difference leads to potentially biased estimates of the relationship between land and productivity. 2013-09-27T18:36:07Z 2013-09-27T18:36:07Z 2013-07 http://documents.worldbank.org/curated/en/2013/07/18055670/guesstimates-gpstimates-land-area-measurement-implications-agricultural-analysis http://hdl.handle.net/10986/15910 English en_US Policy Research Working Paper;No. 6550 CC BY 3.0 IGO http://creativecommons.org/licenses/by/3.0/igo/ World Bank World Bank, Washington, DC Publications & Research :: Policy Research Working Paper Publications & Research Malawi Niger Tanzania Uganda
repository_type	Digital Repository
institution_category	Foreign Institution
institution	Digital Repositories
building	World Bank Open Knowledge Repository
collection	World Bank
language	English en_US
topic	AGRICULTURAL DEVELOPMENT AGRICULTURAL INFORMATION AGRICULTURAL INNOVATION AGRICULTURAL PRODUCTION AGRICULTURE CONSTANT RETURNS TO SCALE COUNTRY CASE STUDIES CROPS DATA COLLECTION DEVELOPMENT ECONOMICS DEVELOPMENT POLICY DEVELOPMENT RESEARCH DRIVING ECONOMETRIC ANALYSIS ECONOMETRICS ECONOMICS ELASTICITY EQUATIONS EQUIPMENT FARMERS FARMS FIELD EXPERIMENTS GENDER GLOBAL POSITIONING SYSTEM GLOBAL POSITIONING SYSTEMS GPS INNOVATION LIVING STANDARDS survey design land measurement inverse productivity relationship
spellingShingle	AGRICULTURAL DEVELOPMENT AGRICULTURAL INFORMATION AGRICULTURAL INNOVATION AGRICULTURAL PRODUCTION AGRICULTURE CONSTANT RETURNS TO SCALE COUNTRY CASE STUDIES CROPS DATA COLLECTION DEVELOPMENT ECONOMICS DEVELOPMENT POLICY DEVELOPMENT RESEARCH DRIVING ECONOMETRIC ANALYSIS ECONOMETRICS ECONOMICS ELASTICITY EQUATIONS EQUIPMENT FARMERS FARMS FIELD EXPERIMENTS GENDER GLOBAL POSITIONING SYSTEM GLOBAL POSITIONING SYSTEMS GPS INNOVATION LIVING STANDARDS survey design land measurement inverse productivity relationship Carletto, Calogero Gourlay, Sydney Winters, Paul From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
geographic_facet	Malawi Niger Tanzania Uganda
relation	Policy Research Working Paper;No. 6550
description	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. Measures employing Global Positioning Systems, on the other hand, while not perfect especially on smaller plots, are likely to provide more precise measures and errors less correlated with agricultural outcomes. This paper uses data from four African countries to compare the use of self-reported and Global Positioning Systems land measures to (1) examine the differences between the measures, (2) identify the sources of the differences, and (3) assess the implications of the different measures on agricultural analysis focusing on the inverse productivity relationship. The results indicate that self-reported land areas systematically differ from Global Positioning Systems land measures and that this difference leads to potentially biased estimates of the relationship between land and productivity.
format	Publications & Research :: Policy Research Working Paper
author	Carletto, Calogero Gourlay, Sydney Winters, Paul
author_facet	Carletto, Calogero Gourlay, Sydney Winters, Paul
author_sort	Carletto, Calogero
title	From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
title_short	From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
title_full	From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
title_fullStr	From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
title_full_unstemmed	From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis
title_sort	from guesstimates to gpstimates : land area measurement and implications for agricultural analysis
publisher	World Bank, Washington, DC
publishDate	2013
url	http://documents.worldbank.org/curated/en/2013/07/18055670/guesstimates-gpstimates-land-area-measurement-implications-agricultural-analysis http://hdl.handle.net/10986/15910
_version_	1764431935691554816

From Guesstimates to GPStimates : Land Area Measurement and Implications for Agricultural Analysis

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