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Logistic回归的ArctanLASSO惩罚似然估计及应用 被引量:5
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作者 秦磊 谢邦昌 《数量经济技术经济研究》 CSSCI 北大核心 2015年第6期135-146,共12页
Logistic回归是计量经济学中应用最广的离散选择模型。当变量个数较多时,极大似然估计解释性较差,为此本文基于新的惩罚函数ArctanLASSO,给出Logistic回归的一种非凸惩罚似然估计进行参数估计和变量选取,并证明了估计量的n^(1/2)相合性... Logistic回归是计量经济学中应用最广的离散选择模型。当变量个数较多时,极大似然估计解释性较差,为此本文基于新的惩罚函数ArctanLASSO,给出Logistic回归的一种非凸惩罚似然估计进行参数估计和变量选取,并证明了估计量的n^(1/2)相合性和Oracle性质。本文结合二阶近似处理、LLA方法和梯度下降法给出估计算法,并通过最小化BIC准则对正则化参数进行选取。模拟数据分析显示,当样本量较大时,该方法在参数估计和变量选取两个方面都优于传统的LASSO、SCAD和MCP方法,样本量较小时,该方法同样具有很大优势。实际数据分析表明,该方法很好地权衡了拟合程度和非零系数的选择,是最优的备选模型,具有重要的实际意义。 展开更多
关键词 LOGISTIC回归 ArctanLASSO惩罚似然估计 n^1/2相合性 Oracle性质
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Asymptotics for partly linear regression with dependent samples and ARCH errors:consistency with rates 被引量:3
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作者 卢祖帝 I.Gijbels 《Science China Mathematics》 SCIE 2001年第2期168-183,共16页
Partly linear regression model is useful in practice, but littleis investigated in the literature to adapt it to the real data which are dependent and conditionally heteroscedastic. In this paper, the estimators of th... Partly linear regression model is useful in practice, but littleis investigated in the literature to adapt it to the real data which are dependent and conditionally heteroscedastic. In this paper, the estimators of the regression components are constructed via local polynomial fitting and the large sample properties are explored. Under certain mild regularities, the conditions are obtained to ensure that the estimators of the nonparametric component and its derivatives are consistent up to the convergence rates which are optimal in the i.i.d. case, and the estimator of the parametric component is root-n consistent with the same rate as for parametric model. The technique adopted in the proof differs from that used and corrects the errors in the reference by Hamilton and Truong under i.i.d. samples. 展开更多
关键词 ARCH (GARCH) errors dependent samples local polynomial fitting convergence rates partly linear model root-n consistency
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