Ranking Crop Yield Models: A Comment
讨论了近期AJAE文章中参数模型排名可能受规范问题影响，提出基于概率分布函数获得最灵活参数模型规范的方法，并建议未来比较和应用采用这些更灵活的规范。
This comment discusses key specification issues that may have affected the performance and, therefore, the ranking of parametric models that were compared in a recent AJAE article. A procedure to obtain the most flexible parametric model specification possible, given the particular probability distribution function on which the model is based is presented. These specifications also allow for standardized and, therefore, more valid comparisons across parametric models that are based on different probability distributions. Finally, the comment cautions against generalization of the rankings in that AJAE article and recommends that these more flexible specifications be adopted in future comparisons and applications.