2 citations · 3 across the 3 of their papers we have counts for
4 papers
Relationship between Collider Bias and Interactions on the Log-Additive Scale
Apostolos Gkatzionis, Shaun R. Seaman, Rachael A. Hughes +1
Collider bias occurs when conditioning on a common effect (collider) of two variables . In this manuscript, we quantify the collider bias in the estimated association between…
Using Instruments for Selection to Adjust for Selection Bias in Mendelian Randomization
Apostolos Gkatzionis, Eric J. Tchetgen Tchetgen, Jon Heron +2
Selection bias is a common concern in epidemiologic studies. In the literature, selection bias is often viewed as a missing data problem. Popular approaches to adjust for bias due…
Statistical Methods for cis-Mendelian Randomization with Two-sample Summary-level Data
Apostolos Gkatzionis, Stephen Burgess, Paul J. Newcombe
Mendelian randomization is the use of genetic variants to assess the existence of a causal relationship between a risk factor and an outcome of interest. Here, we focus on two-samp…
Contextualizing selection bias in Mendelian randomization: how bad is it likely to be?
Apostolos Gkatzionis, Stephen Burgess
Selection bias affects Mendelian randomization investigations when selection into the study sample depends on a collider between the genetic variant and confounders of the risk fac…