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arXiv 1901.09883stat.ME
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在模拟理论多变量模型中,倾向得分匹配低估了真实处理效应

Propensity Score Matching underestimates Real Treatment Effect, in a simulated theoretical multivariate model

Daniel García Iglesias

摘要:

倾向得分匹配(PSM)是一种有效的方法,可以减少观察性研究中治疗选择偏倚对因果效应估计的影响。在匹配之后,PSM显著减少了被调查的样本,这可能导致其他可能的偏差。从这个意义上说,我们想分析的行为,这种PSM与其他广泛使用的方法来处理不可比较的群体相比,是多元回归模型(MRM)。蒙特卡罗模拟,以构建具有不同效果的群体,以比较PSM和MRM估计这种效果的行为。还计算了PSM的治疗选择偏倚减少。使用PSM可降低治疗选择偏倚,降低相对真实处理效应估计误差,但尽管降低了偏倚和估计误差,与PSM相比,MRM显著降低了该估计误差。此外,PSM导致样品的不显著减少。这种从匹配过程中获得的信息的丢失可能导致另一个未知的偏差,因此,与MRM相比,效果估计不准确。

英文摘要:

Propensity Score Matching (PSM) is an useful method to reduce the impact ofTreatment - Selection Bias in the estimation of causal effects in observational studies. After matching, the PSM significantly reduces the sample under investigation, which may lead to other possible biases. In this sense, we want to analyse the behaviour of this PSM compared with other widely used method to deal with non-comparable groups, as is the Multivariate Regression Model (MRM). Monte Carlo Simulations are made to construct groups with different effects in order to compare the behaviour of PSM and MRM estimating this effects. Also the Treatment - Selection Bias reduction for the PSM is calculated. With the PSM a reduction in the Treatment - Selection Bias is achieved, with a reduction in the Relative Real Treatment Effect Estimation Error, but despite of this bias reduction and estimation error reduction, the MRM significantly reduces more this estimation error compared with the PSM. Also the PSM leads to a not insignificant reduction of the sample. This loss of information derived from the matching process may lead to another not known bias, and thus, to the inaccurate of the effect estimation compared with the MRM.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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