TY - JOUR

T1 - On testing a subset of regression parameters under heteroskedasticity

AU - Wen, Miin Jye

AU - Chen, Shun Yi

AU - Chen, Hubert J.

N1 - Funding Information:
This research was supported by National Science Council NSC92-2119-M-006-007 and NSC93-2118-M-006-008, and NSC94-2118-M-032-001, Taiwan, 2003–2005, and also by the University of Georgia, USA.

PY - 2007/8/15

Y1 - 2007/8/15

N2 - Assuming a general linear model with unknown and possibly unequal normal error variances, the interest is to develop a one-sample procedure to handle the hypothesis testing on all, partial, or a subset of linear functions of regression parameters. The sampling procedure is to split up each single sample of size ni at a controllable regressor's data point into two portions, the first consisting of the ni - 1 observations for initial estimation and the second consisting of the remaining one for overall use in the final estimation in order to define a weighted sample mean based on all sample observations at each data point. Then, the weighted sample mean is used to serve as a basis for parameter estimates and test statistics for a general linear regression model. It is found that the distributions of the test statistics based on the weighted sample means are completely independent of the unknown variances. This method can be applied to analysis of variance under various designs of experiments with unequal variances.

AB - Assuming a general linear model with unknown and possibly unequal normal error variances, the interest is to develop a one-sample procedure to handle the hypothesis testing on all, partial, or a subset of linear functions of regression parameters. The sampling procedure is to split up each single sample of size ni at a controllable regressor's data point into two portions, the first consisting of the ni - 1 observations for initial estimation and the second consisting of the remaining one for overall use in the final estimation in order to define a weighted sample mean based on all sample observations at each data point. Then, the weighted sample mean is used to serve as a basis for parameter estimates and test statistics for a general linear regression model. It is found that the distributions of the test statistics based on the weighted sample means are completely independent of the unknown variances. This method can be applied to analysis of variance under various designs of experiments with unequal variances.

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U2 - 10.1016/j.csda.2006.11.018

DO - 10.1016/j.csda.2006.11.018

M3 - Article

AN - SCOPUS:34547187201

SN - 0167-9473

VL - 51

SP - 5958

EP - 5976

JO - Computational Statistics and Data Analysis

JF - Computational Statistics and Data Analysis

IS - 12

ER -