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一、回归分析的概念 (一)变量之间的确定性关系与非确定性关系。自然界所有变量之间的关系,可分为如下两种类型: 1、确定性的关系:例如欧姆定律:V=IR是呈函数关系:在此式中,V表示电压,R表示电阻,I表示电流。这三个变量中,如有两个已知,则另一个就可以精确地计算出来。这种变量之间的关系,叫做确定性关系。 2、非确定性的关系。例如不同施肥量与作物产量的关系。一般来说,施肥的多少与作物单位面积的产量有关,但这种关系是不确定的,因为即使在同样的肥料用量下,单位面积的产量也不是确定的,这种变量之间的关系,叫做非确定性关系。他们之间不呈函数关系,而是相关的关系。
First, the concept of regression analysis (A) the relationship between variables and non-deterministic relationship. The relationship between all the variables in nature can be divided into the following two types: 1. Deterministic relationship: For example, Ohm’s law: V = IR is a functional relationship: In this formula, V represents voltage, R represents resistance, I represents Current. If any of the three variables are known, the other one can be accurately calculated. The relationship between these variables is called a deterministic relationship. 2, non-deterministic relationship. For example, the relationship between different fertilizers and crop yields. In general, the amount of fertilization is related to the yield per unit area of a crop, but the relationship is uncertain because the yield per unit area is not definitive even for the same amount of fertilizer and the relationship between such variables, Called a non-deterministic relationship. They are not a functional relationship, but a related relationship.