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Here you can obtain the replication materials for "Ideological Extremism, Perceived Partisan Polarization, and Democratic Support". Included files: * Online appendix polarization.pdf: describes data sources and required code to create new variables, replicate analyses, and create tables and figures. Includes also tables and figures mentioned but not included in the main manuscript. * Merge57+PABvariables050521.dta: Stata file with the 2019 Comparative National Election project merged dataset. * V-Dem_CNEP_ElecYrs_421.dta: Stata file with V-Dem v2xregime data. * Stata .do file creating all main independent and dependent variables and producing all OLS analyses and tables. * Extremism_polarization_GAM.R: R script performing GAM analyses and plots.