Figure 4.
Schematic for Non-Overlap in Propensity Score Distributions – Exclusion (Trimming) of Non-Overlap (Shaded Areas) Reduces Model Extrapolation to Covariate Patterns in Which No Treatment Comparison Can Be Made (“Non-Positivity”)
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.