Convergence of linear functionals of the Grenander estimator under misspecification
Convergence of linear functionals of the Grenander estimator under misspecification
复制标题
错误指定下 Grenander 估计量的线性泛函的收敛性
DOI:
10.1214/13-aos1196
复制
发表时间:
2012
期刊:
影响因子:
--
通讯作者:
H. Jankowski
中科院分区:
文献类型:
--
作者:
H. Jankowski
Under the assumption that the true density is decreasing, it is well known that the Grenander estimator converges at rate $n^{1/3}$ if the true density is curved [Sankhy\={a} Ser. A 31 (1969) 23-36] and at rate $n^{1/2}$ if the density is flat [Ann. Probab. 11 (1983) 328-345; Canad. J. Statist. 27 (1999) 557-566]. In the case that the true density is misspecified, the results of Patilea [Ann. Statist. 29 (2001) 94-123] tell us that the global convergence rate is of order $n^{1/3}$ in Hellinger distance. Here, we show that the local convergence rate is $n^{1/2}$ at a point where the density is misspecified. This is not in contradiction with the results of Patilea [Ann. Statist. 29 (2001) 94-123]: the global convergence rate simply comes from locally curved well-specified regions. Furthermore, we study global convergence under misspecification by considering linear functionals. The rate of convergence is $n^{1/2}$ and we show that the limit is made up of two independent terms: a mean-zero Gaussian term and a second term (with nonzero mean) which is present only if the density has well-specified locally flat regions.
影响因子:
1.1
作者:
Jankowski,HannaK;Wellner,JonA
通讯作者:
Wellner,JonA
影响因子:
4.5
作者:
Balabdaoui F;Rufibach K;Wellner JA
通讯作者:
Wellner JA