arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0812.3612stat.ME
收藏

一般参数化多元正态回归模型的偏差校正

Bias correction in a multivariate normal regression model with general parameterization

Alexandre G. Patriota, Artur J. Lemonte

摘要:

本文给出了一般参数化下多元正态模型的偏差校正格式。在该模型中,均值向量和协方差阵共享相同的参数。它包括许多重要的回归模型在文献中作为特殊情况,如(非)线性回归,误差变量模型,等等。此外,异方差的情况下,也可以在我们的框架内进行研究。本文导出了模型参数的最大似然估计的二阶偏差的一般表达式,并证明了用普通的加权最小二乘回归总是可以得到二阶偏差的.我们启发这样的一般表达式与变量误差模型,并进行了一些模拟,以验证性能的校正估计。仿真结果表明,偏差校正方案产生接近无偏估计量。我们还提出了一个经验说明。

英文摘要:

This paper develops a bias correction scheme for a multivariate normal model under a general parameterization. In the model, the mean vector and the covariance matrix share the same parameters. It includes many important regression models available in the literature as special cases, such as (non)linear regression, errors-in-variables models, and so forth. Moreover, heteroscedastic situations may also be studied within our framework. We derive a general expression for the second-order biases of maximum likelihood estimates of the model parameters and show that it is always possible to obtain the second order bias by means of ordinary weighted lest-squares regressions. We enlighten such general expression with an errors-in-variables model and also conduct some simulations in order to verify the performance of the corrected estimates. The simulation results show that the bias correction scheme yields nearly unbiased estimators. We also present an empirical ilustration.

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。

↑