ECONOMIC SCIENCES Correction for “Greater Internet use is not associated with faster growth in political polarization among US demographic groups,” by Levi Boxell, Matthew Gentzkow, and Jesse M. Shapiro, which was first published September 19, 2017; 10.1073/pnas.1706588114 (Proc Natl Acad Sci USA 114:10612–10617).

The authors wish to note the following: “For the pre-2016 data, we incorrectly coded all females as males and all males as females. The 2016 data was correctly coded. This error affected Tables S2 and S5 in the SI Appendix, Figs. S2, S4, and S12 in the SI Appendix, and Fig. 4 in the main text. No statements made in the published article need to be corrected as a result of these changes. The replication code and SI have been updated to reflect these changes.” The corrected figure and its legend appear below. The SI Appendix file and the Dataset S1 file have been corrected online.

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Fig. 4.

Trends in polarization by predicted Internet use. The plot shows the polarization index broken out by quartile of predicted Internet use within each survey year. The bottom quartile includes values that are at or below the 25th percentile, while the top quartile includes values greater than the 75th percentile. Shaded regions represent 95% pointwise CIs constructed from a nonparametric bootstrap with 100 replicates. See main text for definitions and SI Appendix, section 3 for details on the bootstrap procedure.