Are Crop Yields Normally Distributed?

Richard Just and Quinn Weninger ()

American Journal of Agricultural Economics, 1999, vol. 81, issue 2, 287-304

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.

Date: 1999
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