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二化螟的发生量是多因子影响的结果。然而,多因子的综合利用回归分析法太麻烦,如果用综合相关法(朱伯承,1975)来分析就容易得多。这里所谈多因子综合相关法的基本原理是对预报量在各种因子作用下出现的概率作出估计。在估计一种因子对预报量所起的作用时,是看它在一定的水准上预报量出现某种等级的概率,然后将各种可能的概率综合起来,以便从各种因子的不同等级水准的变化,推算预报量等级的概率,这种方法的优点是计算简单。
The occurrence of Chilo suppressalis is a result of multifactorial effects. However, regression analysis of comprehensive utilization of multiple factors is too cumbersome, and it is much easier to analyze using the comprehensive correlation method (Zhu Boxing, 1975). The basic principle of the multi-factor comprehensive correlation method discussed here is to estimate the probability of the forecast quantity occurring under the influence of various factors. In estimating the effect of a factor on the forecast, it is a measure of the probability at which it will appear at a certain level of forecasting, and then synthesize the various possible probabilities in order to distinguish between different levels of various factors The probability of forecasting the level of forecasting, the advantage of this method is that the calculation is simple.