Causal Inference Application v4: Introducing GeoLift

April 8, 2026

This technical deep dive announces the Causal Inference Application v4, which fully integrates the GeoLift framework for robust geo experimentation and lift measurement. The article details the v4 app's engineering, including the use of an R-to-Python bridge (rpy2) to incorporate the official GeoLift and CausalImpact R packages for accuracy and stability. Finally, it provides a side-by-side comparison with Bayesian Structural Time Series (BSTS).