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四.方差分析(F检验) (一)意义方差分析是多个均数之间的差异显著性检验方法。方差分析又称变异数分析,是将全部观察值之间的变异(即总变异),分为两个或多个组成部分进行分析。下面只介绍单因素的方差分析。如为完全随机设计资料,总变异分为组间变异(表示各处理组均数间的变异)和组内变异(表示同一组内个体间的变异,通常称为误差)。如为随机区
IV. Analysis of variance (F test) (I) Analysis of variance is a method of testing the significance of differences between multiple means. Variance analysis, also known as variance analysis, involves the analysis of the variation (ie, total variation) between all observations into two or more components. The following only introduces single-factor analysis of variance. For completely random design data, the total variation is divided into between-group variation (representing variation between the mean of each treatment group) and intra-group variation (representing variation between individuals within the same group, often referred to as error). If random