Is it who you are or where you are? Accounting for compositional differences in cross-site treatment variation
是个体构成还是所在环境?分解跨站点处理效应差异
Multisite trials, in which treatment is randomized separately in multiple sites, offer a unique opportunity to disentangle treatment effect variation due to "compositional" differences in the distributions of unit-level features from variation due to "contextual" differences in site-level features. In particular, if we can re-weight (or "transport") each site to have a common distribution of unit-level covariates, the remaining effect variation captures contextual…