Identification and estimation in panel models with overspecified number of groups
Identification and estimation in panel models with overspecified number of groups
复制标题
具有过度指定组数的面板模型中的识别和估计
DOI:
10.1016/j.jeconom.2019.09.008
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发表时间:
2020-04
影响因子:
6.3
通讯作者:
Zhou Qiankun
中科院分区:
文献类型:
--
作者:
Liu Ruiqi;Shang Zuofeng;Zhang Yonghui;Zhou Qiankun
We propose a simple and fast approach to identify and estimate the unknown group structure in panel models by adapting the M-estimation method. We consider both linear and nonlinear panel models where the regression coefficients are heterogeneous across groups but homogeneous within a group and the group membership is unknown to researchers. The main result of the paper is that under certain assumptions, our approach is able to provide uniformly consistent estimation as long as the number of groups used in estimation is not smaller than the true number of groups. We also show that, asymptotically, our method may partition some true groups into further subgroups, but cannot mix units from different groups. When the true number of groups is used in estimation, all units can be categorized correctly with probability approaching one, and we establish the limiting distribution for the estimators of the group parameters. In addition, we provide an information criterion to select the number of groups, and establish the consistency of the selection criterion under some mild conditions. Monte Carlo simulations are conducted to examine the finite sample performance of the proposed method. The findings in the simulation confirm our theoretical results in the paper. Applications to two real datasets also highlight the necessity to consider both individual heterogeneity and group heterogeneity in the model. (C) 2019 Elsevier B.V. All rights reserved.
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DOI:
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2015
期刊:
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通讯作者:
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