摘要
因子的优劣是回归分析的关键。故在建立回归方程时,一般除对预报因子进行直线相关普查外,还要进行非线性相关普查。如将原因子x用x^(-1)、x^(1/2)、x^2 、e^x、In x等函数形式进行变换。但由于这些函数形式有限,故不一定能找到最优的表达形式;为此冯耀煌等仅给出了x^a和e^(ax)两种通式。
By discussing the relationship between predictor and predictand (i.e. yield) in yield prediction, the basic form of linear and nonlinear transformation of predictor was summed up. The calculation method of parameter in the form was qiven out, based on the principles of optimization method, and at the same time the optimal predictors were selected. In addtion, the weighted model of multi-regression for yield prediction was established, based on the stage of plant.
出处
《气象学报》
CSCD
北大核心
1992年第4期514-517,共4页
Acta Meteorologica Sinica
