皮尔逊克方检验法是常用的检验样本是否遵从某一理论分布的方法之一。用来检验样本的正态性有其明显优点。一是计算比较简便,尤其是当样本很大时更为优越,二是它和置信带法一样,具有很高的辨别能力。它的缺点是不适用于样品数不足50的小样本。此外,计算结果受组距的影响,尤其是当样本不很大时,不同的组距会得出不同的累计克方值,然而,它仍不失是一个较好的方法。 Pearson’s square test is one of the commonly used methods to test whether a sample follows a certain theoretical distribution. There are obvious advantages to testing the normality of the sample. First, the calculation is relatively simple, especially when the sample is more superior, and second, it is the same as the confidence band method, with a high ability to distinguish. Its disadvantage is that it does not apply to small samples with less than 50 samples. In addition, the calculation results are affected by the group distance, especially when the sample size is not very large, different group distances will yield different cumulative CR values, however, it is still a good method.