期刊名称：Brazilian Journal of Probability and Statistics
印刷版ISSN：0103-0752
出版年度：2001
卷号：15
期号：2
页码：121-134
出版社：Brazilian Statistical Association
摘要：Nielsen, G.G.; Gill, R.D.; Andersen, P.K.; Sorensen, T.I.A. (1992) propose aconsistent and asymptotically normal estimator for the variance of the frailtydistribution under gamma assumption. A simulation study shows that this esti-mator is asymptotically biased for log-normal and absolute value of normal frailtydistributions
