45 citations · 111 across the 31 of their papers we have counts for
7 papers · 1 filter
Testing Endogeneity with High Dimensional Covariates
Zijian Guo, Hyunseung Kang, T. Tony Cai +1
Modern, high dimensional data has renewed investigation on instrumental variables (IV) analysis, primarily focusing on estimation of effects of endogenous variables and putting lit…
Optimal Estimation of Co-heritability in High-dimensional Linear Models
Zijian Guo, Wanjie Wang, T. Tony Cai +1
Co-heritability is an important concept that characterizes the genetic associations within pairs of quantitative traits. There has been significant recent interest in estimating th…
Confidence Intervals for Causal Effects with Invalid Instruments using Two-Stage Hard Thresholding with Voting
Zijian Guo, Hyunseung Kang, T. Tony Cai +1
A major challenge in instrumental variables (IV) analysis is to find instruments that are valid, or have no direct effect on the outcome and are ignorable. Typically one is unsure…
Accuracy Assessment for High-dimensional Linear Regression
T. Tony Cai, Zijian Guo
This paper considers point and interval estimation of the loss of an estimator in high-dimensional linear regression with random design. We establish the minimax rate for…
Control Function Instrumental Variable Estimation of Nonlinear Causal Effect Models
Zijian Guo, Dylan Small
The instrumental variable method consistently estimates the effect of a treatment when there is unmeasured confounding and a valid instrumental variable. A valid instrumental varia…
Using an Instrumental Variable to Test for Unmeasured Confounding
Zijian Guo, Jing Cheng, Scott A. Lorch +1
An important concern in an observational study is whether or not there is unmeasured confounding, i.e., unmeasured ways in which the treatment and control groups differ before trea…
Mediation Analysis for Count and Zero-Inflated Count Data without Sequential Ignorability and Its Application in Dental Studies
Zijian Guo, Dylan S. Small, Stuart A. Gansky +1
Mediation analysis seeks to understand the mechanism by which a treatment affects an outcome. Count or zero-inflated count outcome are common in many studies in which mediation ana…