Are Crop Yields Normally Distributed?
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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|Date of creation:||01 May 1999|
|Date of revision:|
|Publication status:||Published in American Journal of Agricultural Economics, May 1999, vol. 81 no. 2, pp. 287-304|
|Contact details of provider:|| Postal: Iowa State University, Dept. of Economics, 260 Heady Hall, Ames, IA 50011-1070|
Phone: +1 515.294.6741
Fax: +1 515.294.0221
Web page: http://www.econ.iastate.edu
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