Comparison of crop model validation methods
2012
Cao Hongxin, Jiangsu Academy of Agricultural Sciences, Nanjing (China), Institute of Agricultural Economics and Information | Jim Scott Hanan, The University of Queensland, Queensland (Australia), Centre for Biological Information Technology | Liuyan, Jiangsu Academy of Agricultural Sciences, Nanjing (China), Institute of Agricultural Economics and Information
In this paper, the many indices used in validation of crop models, such as RMSE (root mean square errors), Sd (standard error of absolute difference), da (mean absolute difference), dap (ratio of da to the mean observation), r (correlation), and R2 (determination coefficient), are compared for the same rice architectural parameter model, and their advantages and disadvantages are analyzed. A new index for validation of crop models, dap between the observed and the simulated values, is proposed, with dap5% as the suggested standard for precision of crop models. The different kinds of validation methods in crop models should be combined in the following aspects: (1) calculating da and dap; (2) calculating the RMSE or Sd; (3) calculating r and R2, at the same time, plotting 1:1 diagram.
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