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本文利用半参数分析的原理与方法,建立手机特征价格指数的半参数回归模型,并进一步讨论了半参数模型的估计方法、Hausman检验及拟合优度比较方法。同时建立了普通线性回归模型,通过对比可知,半参数回归模型的效果优于普通线性回归模型。根据半参数回归模型,本文编制了合并数据的手机特征价格指数,结果发现手机的价格指数是逐月下降的,这也符合实际预期。
Based on the principle and method of semi-parametric analysis, this paper establishes a semi-parametric regression model for the feature price index of mobile phones, and further discusses the estimation methods of semiparametric models, the Hausman test and the comparison of goodness-of-fit. At the same time, an ordinary linear regression model was established. The comparison shows that the semiparametric regression model is better than the ordinary linear regression model. According to the semiparametric regression model, this paper compiled the feature price index of mobile phone with combined data, and found that the price index of mobile phone decreased month by month, which is in line with the actual expectation.