Identification and inference with nonignorable missing covariate data.
Identification and inference with nonignorable missing covariate data.
复制标题
识别和推断不可签名的丢失协变量数据。
DOI:
10.5705/ss.202016.0322
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发表时间:
2018-10
影响因子:
1.4
通讯作者:
Tchetgen Tchetgen E
中科院分区:
文献类型:
--
作者:
Miao W;Tchetgen Tchetgen E
We study identification of parametric and semiparametric models with missing covariate data. When covariate data are missing not at random, identification is not guaranteed even under fairly restrictive parametric assumptions, a fact that is illustrated with several examples. We propose a general approach to establish identification of parametric and semiparametric models when a covariate is missing not at random. Without auxiliary information about the missingness process, identification of parametric models is strongly dependent on model specification. However, in the presence of a fully observed shadow variable, which is correlated with the missing covariate but otherwise independent of its missingness, identification is more broadly achievable, including in fairly large semiparametric models. With a shadow variable, special consideration is given to the generalized linear models with the missingness process unrestricted. Under such a setting, the outcome model is identified for familiar generalized linear models, and we provide counterexamples when identification fails. For estimation, we describe an inverse probability weighted estimator that incorporates the shadow variable to estimate the missingness process, and we evaluate its performance via simulations.
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DOI:
10.1093/biostatistics/kxu023
发表时间:
2014-10
期刊:
Biostatistics (Oxford, England)
影响因子:
--
作者:
Bartlett JW;Carpenter JR;Tilling K;Vansteelandt S
通讯作者:
Vansteelandt S
影响因子:
3.7
作者:
Angrist, JD;Imbens, GW;Rubin, DB
通讯作者:
Rubin, DB
影响因子:
3.7
作者:
EDGETT, GL
通讯作者:
EDGETT, GL
影响因子:
3.7
作者:
GLASSER, M
通讯作者:
GLASSER, M
影响因子:
5.2
作者:
Heckman, J
通讯作者:
Heckman, J