Research Article
Research on Food Security Risk Assessment and Early Warning in China Based on BP Neural Network Model
Table 2
Objective weights of early warning indicators based on PCA method.
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Note. The coefficients of the three indicators C6, C7, and C8 in the comprehensive scoring model are negative values, so this paper obtains the absolute value of the coefficients of the sub-model when taking their weights. | ||||||||||||||||||||||||||||||||||