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AI 根据所提供的论文材料归类:摘要以干预分布和 do-calculus 定义因果效应,并联合学习因果图与效应参数。

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类别变量图模型的联合结构学习与因果效应估计

研究问题
对于由类别变量构成的因果图,如何在图结构未知时估计干预效应,并将不同图模型带来的不确定性纳入后验推断?
方法与思路
作者按有向无环图分解类别分布,设置 Dirichlet 先验,使用可逆跳跃 MCMC 联合采样图与参数并形成效应后验。
材料陈述的贡献
摘要称方法可对图结构不确定性进行平均,获得因果效应完整后验及模型平均估计,并在模拟中展示较高估计准确性。
阅读关注点
应核对观测数据能区分哪些图与效应、先验对模型平均的影响,以及采样收敛和模拟比较的识别条件是否一致。
阅读边界
所据为 arXiv 预印本,同行评审或期刊接收未经核实;摘要未交代完整因果识别限制,效应后验不代表因果关系已获验证。

原文摘要

We consider a a collection of categorical random variables. Of special interest is the causal effect on an outcome variable following an intervention on another variable. Conditionally on a Directed Acyclic Graph (DAG), we assume that the joint law of the random variables can be factorized according to the DAG, where each term is a categorical distribution for the node-variable given a configuration of its parents. The graph is equipped with a causal interpretation through the notion of interventional distribution and the allied "do-calculus". From a modeling perspective, the likelihood is decomposed into a product over nodes and parents of DAG-parameters, on which a suitably specified collection of Dirichlet priors is assigned. The overall joint distribution on the ensemble of DAG-parameters is then constructed using global and local independence. We account for DAG-model uncertainty and propose a reversible jump Markov Chain Monte Carlo (MCMC) algorithm which targets the joint posterior over DAGs and DAG-parameters; from the output we are able to recover a full posterior distribution of any causal effect coefficient of interest, possibly summarized by a Bayesian Model Averaging (BMA) point estimate. We validate our method through extensive simulation studies, wherein comparisons with alternative state-of-the-art procedures reveal an outperformance in terms of estimation accuracy. Finally, we analyze a dataset relative to a study on depression and anxiety in undergraduate students.

笔记与分组