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在病害流行的多因素分析中,通常将病害发生的程度做为因变量 y,将影响病害发生及流行程度的各因素做为自变量 X_i。通径分析法就是根据各变量之间相互作用的关系,把自变量 X_i与因变量 y 的单相关系数 ri_y 分解成直接通径系数 P_(iy)和间接通径系数二部分。直接通径系数就是回归分析中的标准偏回归系。能够通过它的绝对值大小,反映出各自变量 X_i 对因变量 y 的相对重要性。在影响病害发生及流行的因素分析中,可以帮助人们找出其中的主要因素,从而减少一般回归分析中的非逻辑性错误。
In multivariate analysis of disease prevalence, the degree of disease occurrence is usually taken as the dependent variable y, and the factors that affect the occurrence and prevalence of the disease are taken as the independent variable X_i. Path analysis method is based on the relationship between the variables of the relationship between the independent variable X_i and dependent variable y single correlation coefficient ri_y decomposition into direct path coefficient P_ (iy) and indirect path coefficient of two parts. The direct path coefficient is the standard deviation regression in regression analysis. Through its absolute size, it reflects the relative importance of each variable X_i to the dependent variable y. In the analysis of the factors influencing the occurrence and prevalence of diseases, people can find out the main factors and reduce the non-logical errors in the general regression analysis.