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一、单一自由度比较的概念单一自由度比较是一种处理比较设计。通过这种设计,使每一比较皆彼此独立、且各具有一个自由度。因而对于推断试验前提出的一些特定比较的效应,是非常有效的。为阐明单一自由度比较的特点,我们从一个实例说起。调查了施用和未施用磷钾混合肥的蚕豆田各4块,得每分地的蚕豆产量(斤)于表1。由表1资料可算得:
First, the concept of a single degree of freedom Comparison of single degree of freedom is a comparison of the design. Through this design, each comparison is independent of each other, and each has a degree of freedom. Therefore, it is very effective to infer some specific comparative effects proposed before the experiment. To illustrate the characteristics of a single degree of freedom, let’s start with an example. Four broad bean fields with or without P and K fertilizers were investigated. The yield of each faba bean (kg) in Table 1 was obtained. Table 1 can be obtained from the information: