Two‐step estimation in ratio‐of‐mediator‐probability weighted causal mediation analysis
Two‐step estimation in ratio‐of‐mediator‐probability weighted causal mediation analysis
复制标题
中介者概率加权因果中介分析比率的两步估计
DOI:
10.1002/sim.7581
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发表时间:
2018
影响因子:
2
通讯作者:
Yang, Cheng
中科院分区:
文献类型:
--
作者:
Bein, Edward;Deutsch, Jonah;Hong, Guanglei;Porter, Kristin E.;Qin, Xu;Yang, Cheng
This study investigates appropriate estimation of estimator variability in the context of causal mediation analysis that employs propensity score‐based weighting. Such an analysis decomposes the total effect of a treatment on the outcome into an indirect effect transmitted through a focal mediator and a direct effect bypassing the mediator. Ratio‐of‐mediator‐probability weighting estimates these causal effects by adjusting for the confounding impact of a large number of pretreatment covariates through propensity score‐based weighting. In step 1, a propensity score model is estimated. In step 2, the causal effects of interest are estimated using weights derived from the prior step's regression coefficient estimates. Statistical inferences obtained from this 2‐step estimation procedure are potentially problematic if the estimated standard errors of the causal effect estimates do not reflect the sampling uncertainty in the estimation of the weights. This study extends to ratio‐of‐mediator‐probability weighting analysis a solution to the 2‐step estimation problem by stacking the score functions from both steps. We derive the asymptotic variance‐covariance matrix for the indirect effect and direct effect 2‐step estimators, provide simulation results, and illustrate with an application study. Our simulation results indicate that the sampling uncertainty in the estimated weights should not be ignored. The standard error estimation using the stacking procedure offers a viable alternative to bootstrap standard error estimation. We discuss broad implications of this approach for causal analysis involving propensity score‐based weighting.
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影响因子:
7.6
作者:
BARON, RM;KENNY, DA
通讯作者:
KENNY, DA
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
Whitney Newey
通讯作者:
Whitney Newey
DOI:
10.1515/ijb-2019-0158
发表时间:
2020
期刊:
The international journal of biostatistics
影响因子:
--
作者:
Wang,Kai
通讯作者:
Wang,Kai
影响因子:
4.5
作者:
Tchetgen EJ;Shpitser I
通讯作者:
Shpitser I
影响因子:
5.4
作者:
Petersen, ML;Sinisi, SE;van der Laan, MJ
通讯作者:
van der Laan, MJ