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病虫发生程度是人们根据历年调查的数据和多年实践经验确定的,实际上小发生、中发生、大发生间没有分明的界限,具有模糊性。中发生包涵着中等偏轻和中等偏重。在病虫测报工作中用模糊数学来研究和处理模糊现象,预测病虫发生趋势不仅适宜,还能以把人们的经验吸收进去,比一般数理统计具有明显的优点。 模糊列联表分析估计病虫种群数量变动,就是在模糊数学中最为常用的综合评判。即借助模糊变换的原理。评判的着眼点考虑所有的各个因素,作出对该事物的总的
The occurrence of pests and diseases is determined by people based on data from surveys over the years and years of practical experience. In fact, small occurrences, occurrences and occurrences have no clear boundaries and are ambiguous. Occurred in the middle and the middle of the package. In the pest forecasting work with fuzzy mathematics to study and deal with the fuzzy phenomenon, prediction of pest occurrence trend is not only suitable, but also to absorb the people’s experience than the general mathematical statistics has obvious advantages. Fuzzy contingency table analysis to estimate the number of pest population changes is the most commonly used in fuzzy mathematics comprehensive evaluation. That is with the principle of fuzzy transformation. The point of judging considers all the various factors and makes the total of the thing