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From guesstimates to GPStimates : land area measurement and implications for agricultural analysis
Author:Carletto, Calogero; Gourlay, Sydney; Winters, Paul; Collection Title:Policy Research working paper ; no. WPS 6550
Country:World; Date Stored:2013/07/30
Document Date:2013/07/01Document Type:Policy Research Working Paper
SubTopics:Economic Theory & Research; Science Education; Roads & Highways; E-Business; Rural Development Knowledge & Information SystemsLanguage:English
Major Sector:Agriculture, fishing, and forestryRel. Proj ID:1W-Improving Measurements Of Agricultural Productivity Through Met -- -- P132446;
Region:The World RegionReport Number:WPS6550
Sub Sectors:Agricultural extension and researchTF No/Name:TF012853-Improving Measurements of Agricultural Productivity through Methodologi
Volume No:1 of 1  

Summary: 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.

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