The evidence for nonnormality of crop yields is reassessed. Three methodological problems are identified in typical yield distribution analyses: (i) misspecification of the nonrandom components of yield distributions, (ii) misreporting of statistical significance, and (iii) use of aggregate time-series (ATS) data to represent farm-level yield distributions. One or more of these problems infect virtually all evidence against normality to date. The positive contribution of the article is a set of principles that must be followed in any valid investigation of yield normality.
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Paper provided by Iowa State University, Department of Economics in its series Staff General Research Papers with number
5064.
Length: Date of creation: 01 Mar 2002 Date of revision: Publication status: Published in American Journal of Agricultural Economics, May 1999, Vol. 81, No. 2, pp. 287-304. Handle: RePEc:isu:genres:5064
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Find related papers by JEL classification: Q1 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Agriculture
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