So,the equality examinations(Bartlett examination is adopted usually) are needed before Variance analysis,But the eistribution must be normal distribution and calculation is complilated in the method.

• 因此；在方差分析之前；需进行方差齐性检验；一般用Bartlett检验.；但这一方法要求分布是正态分布且计算繁琐；而用Hartleg检验和Cochran检验计算方便；方法实用;