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arXiv 2009.12686stat.MEstat.AP
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参数比例风险回归模型的稳健假设检验与模型选择

Robust Hypothesis Testing and Model Selection for Parametric Proportional Hazard Regression Models

Amarnath Nandy, Abhik Ghosh, Ayanendranath Basu, Leandro Pardo

摘要:

半参数Cox比例风险回归模型在许多应用科学领域中得到了广泛的应用。然而,一个完全参数的比例风险模型,如果适当的假设,往往可以导致更有效的推理。为了解决传统的极大似然估计的极端非鲁棒性,在这种完全参数比例风险模型下的数据中存在离群值,最近提出了一种稳健估计方法,扩展了最小密度幂散度估计(MDPDE)的概念。本文研究了参数比例风险模型下的统计推断问题,并利用MDPDE方法建立了稳健的Wald型假设检验和模型选择方法。我们还得到了必要的渐近结果,用于构造一般复合假设的检验程序,并研究其渐近功效。通过适当的影响函数分析,从理论上研究了所声称的鲁棒性。我们已经研究了有限样本水平和权力的建议MDPDE基于Wald型测试通过广泛的模拟,比较也与现有的半参数方法。文中还讨论了鲁棒整定参数的选取问题。最后通过三个有趣的实际数据例子说明了所提出的鲁棒性测试和模型选择程序的实际用途。

英文摘要:

The semi-parametric Cox proportional hazards regression model has been widely used for many years in several applied sciences. However, a fully parametric proportional hazards model, if appropriately assumed, can often lead to more efficient inference. To tackle the extreme non-robustness of the traditional maximum likelihood estimator in the presence of outliers in the data under such fully parametric proportional hazard models, a robust estimation procedure has recently been proposed extending the concept of the minimum density power divergence estimator (MDPDE) under this set-up. In this paper, we consider the problem of statistical inference under the parametric proportional hazards model and develop robust Wald-type hypothesis testing and model selection procedures using the MDPDEs. We have also derived the necessary asymptotic results which are used to construct the testing procedure for general composite hypothesis and study its asymptotic powers. The claimed robustness properties are studied theoretically via appropriate influence function analyses. We have studied the finite sample level and power of the proposed MDPDE based Wald type test through extensive simulations where comparisons are also made with the existing semi-parametric methods. The important issue of the selection of appropriate robustness tuning parameter is also discussed. The practical usefulness of the proposed robust testing and model selection procedures is finally illustrated through three interesting real data examples.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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