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

Calogero Carletto, Sydney Gourlay, Paul Conal Winters, Calogero Carletto, Sydney Gourlay and Paul Conal Winters
Authors registered in the RePEc Author Service: Calogero Carletto, Paul C. Winters () and Sydney Gourlay

No 6550, Policy Research Working Paper Series from The World Bank

Abstract: 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.

Keywords: Labor&Employment Law; Food Security; Inequality; Educational Institutions&Facilities; Educational Informatics; Education Information&Communications Technologies; Agricultural Economics (search for similar items in EconPapers)
Date: 2013-07-01
New Economics Papers: this item is included in nep-agr and nep-eff
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (8)

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