Are Crop Yields Normally Distributed?

Quinn Weninger (weninger@iastate.edu) and Richard Just

Staff General Research Papers Archive from Iowa State University, Department of Economics

Abstract: 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.

Date: 1999-05-01
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Published in American Journal of Agricultural Economics, May 1999, vol. 81 no. 2, pp. 287-304

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