Software

An R package implementing the stratification index ( Zhou 2012). The package provides two functions, srank(), which returns stratum-specific information, including population share and average percentile rank; and strat(), which returns the stratification...

This packages implements the regression-with-residuals (RWR) approach to causal mediation analysis, allowing for post-treatment confounding of the mediator-outcome relationship ( Zhou and Wodtke 2019; Wodtke and Zhou 2019). The rwrmed() function fits user...

An R package implementing residual balancing weights for marginal structural models, which can be used to estimate marginal effects of time-varying treatments and also controlled direct/mediator effects in causal mediation analysis ( Zhou and Wodtke 2020)...

In causal mediation analysis with multiple causally ordered mediators, a set of path-specific effects are identified under standard ignorability assumptions. This package implements an imputation approach to estimating these effects along with a set of...

In the generalized Roy model, the marginal treatment effect (MTE) can be used as a building block for constructing conventional causal parameters such as the average treatment effect (ATE) and the average treatment effect on the treated (ATT) ( Heckman...

An R package implementing hierarchical item response theory (IRT) models where both the mean and the variance of latent preferences (ability parameters) may depend on observed covariates ( Zhou 2018). The current implementation includes both the two...