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一、问题的提出要比较某种处理因素(或调查因素,下同)的两个水平下的某种变量值的差别,如比较病人和正常人的某种生理指标值或生化指标值的差别,可用两组资料的 t 检验或配对资料的 t 检验。但配对的 t 检验在每个配对区组内只能是1∶1配对,一般要求配对区组数较多,用实验或调查收集资料比较困难;而且不能研究处理因素和区组因素之间的交互作用。本文
First, the question is asked to compare the difference in the value of a certain variable under certain treatment factors (or investigation factors, the same below) at two levels, such as the difference between a physiological index value or a biochemical index value of a comparison patient and a normal person. The t-test of two sets of data or the t-test of paired data can be used. However, the paired t-test can only be paired with 1:1 within each pairing group. Generally, it requires more pairs of matching groups. It is difficult to collect data by experiment or survey; and it is impossible to study the relationship between treatment factors and group factors. Interaction. This article