The robust variance estimator for two-stage models

被引:82
|
作者
Hardin, James W. [1 ,2 ]
机构
[1] Texas A&M Univ, Dept Stat, College Stn, TX 77843 USA
[2] Texas A&M Univ, Acad Adv Telecommun & Learning Technol, College Stn, TX 77843 USA
来源
STATA JOURNAL | 2002年 / 2卷 / 03期
关键词
st0018; robust variance estimator; Murphy-Topel estimator; two-stage estimation; estimating equation;
D O I
10.1177/1536867X0200200302
中图分类号
O1 [数学]; C [社会科学总论];
学科分类号
03 ; 0303 ; 0701 ; 070101 ;
摘要
This article discusses estimates of variance for two-stage models. We present the sandwich estimate of variance as an alternative to the Murphy-Topel estimate. The sandwich estimator has a simple formula that is similar to the formula for the Murphy-Topel estimator, and the two estimators are asymptotically equal when the assumed model distributions are true. The advantages of the sandwich estimate of variance are that it may be calculated for the complete parameter vector, and that it requires estimating equations instead of fully specified log likelihoods.
引用
收藏
页码:253 / 266
页数:14
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