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Are Crop Yields Normally Distributed?

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  • Richard E. Just
  • Quinn Weninger

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) missreporting of statistical significance, and (iii) use of aggregate timeseries (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. Copyright 1999, Oxford University Press.

Suggested Citation

  • Richard E. Just & Quinn Weninger, 1999. "Are Crop Yields Normally Distributed?," American Journal of Agricultural Economics, Agricultural and Applied Economics Association, vol. 81(2), pages 287-304.
    • Handle: RePEc:oup:ajagec:v:81:y:1999:i:2:p:287-304
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    File URL: http://hdl.handle.net/10.2307/1244582
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