They are all used with the hypothesis of homoscedasticity. Heteroscedasticity will danger accuracy of the model. This thesis introduces heteroscedasticity to the reader.
文章介绍了异方差模型，研究和分析了异方差的检验和利用加权最小二乘法消除异方差对模型的影响。
They are all used with the hypothesis of homoscedasticity. Heteroscedasticity will danger accuracy of the model. This thesis introduces heteroscedasticity to the reader.
文章介绍了异方差模型，研究和分析了异方差的检验和利用加权最小二乘法消除异方差对模型的影响。
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