Evaluation of USDA interval forecasts of corn and soybean prices

Olga Isengildina, Scott H. Irwin, Darrel L. Good

Research output: Contribution to journalArticlepeer-review


USDA World Agricultural Supply and Demand Estimates (WASDE) price forecasts are published as an interval, but are typically analyzed as point estimates. Thus, all information about uncertainty imbedded in the forecast is ignored. The purpose of this article is to evaluate the accuracy of WASDE corn and soybean price forecasts using methodology suitable for testing judgmental interval forecasts. Accuracy tests suggest that WASDE forecasts are not calibrated at the 95% confidence level for both commodities and generally not calibrated for corn, but calibrated for soybeans, at the implied confidence level elicited from the survey of forecast providers.

Original languageEnglish (US)
Pages (from-to)990-1004
Number of pages15
JournalAmerican Journal of Agricultural Economics
Issue number4
StatePublished - Nov 2004
Externally publishedYes


  • Accuracy
  • Corn
  • Evaluation
  • Informativeness
  • Interval forecasts
  • Price

ASJC Scopus subject areas

  • Agricultural and Biological Sciences (miscellaneous)
  • Economics and Econometrics

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