Evaluation of USDA Interval Forecasts of Corn and Soybean Prices
评估美国农业部WASDE报告中的玉米和大豆价格区间预测的准确性，发现玉米预测在95%置信水平下不准确，而大豆预测在隐含置信水平下是准确的。
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.