Fig. 1. Standardized coefficients from two-stage least-squares regression model predicting pro-ISIS Internet search rate normalized by overall search activity in 3099 U.S. counties, 2014–2016.

Red circles describe standardized coefficients, and blue bars describe 90 and 95% confidence intervals (adjusted R² = 0.43). The coefficient for the normalized anti-Muslim search rate is the strongest and only statistically significant predictor of pro-ISIS search volume.