Collaborative Research: A New Design for Identifying Persuasion Effects and Selection in Media Exposure Experiments via Patient Preference Trials

是媒体选择导致两极分化还是两极分化导致媒体选择？ppi调查了这两种因果过程中的一种或两种导致政治态度两极分化的程度。采用医学文献中的程序，pi设计并实施了一个使用强制选择和自由选择场景的实验。使用这个程序可以估计选择性曝光的程度，志同道合的媒体的两极分化程度，以及通过反态度媒体跨越党派通道的说服程度。该方法还涉及对边界的估计，或在选择环境的某些假设下导致不同亚组的治疗效应大小的范围。是媒体选择导致两极分化还是两极分化导致媒体选择？我们调查的程度，其中一个或两个因果过程都有助于态度两极分化。采用医学文献中的患者偏好试验程序，pi设计并实施了一个使用强制选择和自由选择场景的实验。使用这个程序可以估计选择性曝光的程度，志同道合的媒体的两极分化程度，以及通过反态度媒体跨越党派通道的说服程度。在方法上，pi还计算亚组特定治疗效果的非参数界限，并进行敏感性分析，以证明对稳定选择的某些假设的依赖。

GeneralDoes media choice cause polarization or does polarization cause media choice? The PIs investigate the extent to which either or both of these two causal processes contribute to polarization of political attitudes. Adopting a procedure from the medical literature, the PIs design and implement an experiment that uses both a forced-choice and a free-choice scenario. Using this procedure allows for estimation of the degree of selective exposure, the degree of polarization by like-minded media, and the degree of persuasion across the partisan aisle by counter-attitudinal media. This method also involves estimation of bounds, or the range of treatment effect sizes that result in different subgroups under certain assumptions about the choice environment.TechnicalDoes media choice cause polarization or does polarization cause media choice? We investigate the extent to which either or both of these two causal processes contribute to attitude polarization. Adopting the patient preference trial procedure from the medical literature, the PIs design and implement an experiment that uses both a forced-choice and a free-choice scenario. Using this procedure allows for estimation of the degree of selective exposure, the degree of polarization by like-minded media, and the degree of persuasion across the partisan aisle by counter-attitudinal media. Methodologically, the PIs also compute nonparametric bounds on the subgroup-specific treatment effects and conduct sensitivity analyses to demonstrate the reliance on certain assumptions of stable choices.