论文标题
准确的中介分析和二进制介体
Exact mediation analysis for ordinal outcome and binary mediator
论文作者
论文摘要
关于单个调解人环境，此简要报告提出了一种基于模型的策略，以估计反事实直接和间接效应时，当响应变量是序数并且中介器为二进制时。提出了介体的逻辑回归模型和结果的累积逻辑模型，提出了因果效应的确切参数公式，从而扩展了以前的工作，仅包含近似结果。识别条件等同于文献中已经建立的条件。可以通过使用标准统计软件来估计效果，并且可以通过引导算法计算标准错误。为了使方法可以访问，附录中介绍了在R中实现建议的例程。还得出了与假定的数据生成机制相干的自然效应模型。
With reference to a single mediator context, this brief report presents a model-based strategy to estimate counterfactual direct and indirect effects when the response variable is ordinal and the mediator is binary. Postulating a logistic regression model for the mediator and a cumulative logit model for the outcome, the exact parametric formulation of the causal effects is presented, thereby extending previous work that only contained approximated results. The identification conditions are equivalent to the ones already established in the literature. The effects can be estimated by making use of standard statistical software and standard errors can be computed via a bootstrap algorithm. To make the methodology accessible, routines to implement the proposal in R are presented in the Appendix. A natural effect model coherent with the postulated data generating mechanism is also derived.
