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x~2(Kai方)检验,Karl Pearsou早在1899年就提出来了。不论是适合性检验,或是独立性检验,通常,我们总是相应地使用几种不同的数学表达式,去计算出一个x~2值,然后把这个x~2值与x~2表的临界值进行比较,再作出判断。直到今天,人们还习惯于采用这些方法。但是,在cxr表中,计算∑x~2时冗长乏味,所有的理论次数,都要通过分类表的边缘数来进行计算。另外,估算非齐性(heterogeneity)x~2值,与直接算得的x~2有差异,且不能严格地相加。Sokal.R.R.等针对这一缺点,提出了使用对数函数的方法,计算出来的量值是严格可加的,而且更接近
x ~ 2 (Kai square) test, Karl Pearsou was proposed as early as 1899. Generally, we always use several different mathematical expressions to calculate a value of x ~ 2, and then compare the value of x ~ 2 with the value of x ~ 2 The thresholds are compared before making a judgment. Until today, people are accustomed to using these methods. However, in the cxr table, calculating Σx ~ 2 is tedious and time-consuming. All the theoretical times are calculated by the number of edges in the classification table. In addition, estimating heterogeneity x ~ 2 values is different from the direct calculation of x ~ 2 and can not be strictly summed. In response to this shortcoming, Sokal.R.R. et al. Proposed a method that uses a logarithmic function and the calculated magnitude is strictly additive and closer