Study title

The CSES Integrated Module Dataset (IMD) brings together the existing Standalone CSES Modules (CSES Modules 1–5 inclusive) into one longitudinal and harmonized dataset. Variables that appear in at least three Standalone CSES Modules, up to and including CSES Module 5, are eligible for inclusion in IMD, with all polities participating in CSES included in the dataset. All data included in the CSES Integrated Module Dataset (IMD) were collected between 1996 and 2021 and are available in the Standalone CSES Modules, but have been harmonized for IMD, allowing for longitudinal analysis. CSES IMD includes over 395,000 individual-level observations across 230 elections in 59 polities, with voter evaluations of over 800 political parties. Highlights of the IMD file are party and coalition numerical codes synchronized across CSES Modules and the incorporation of data bridging variables allowing CSES data to be easily merged with other common datasets in the social sciences. CSES IMD launched in December 2018 and is being rolled out on a phased basis. More information regarding the CSES IMD can be found in the Comparative Study of Electoral Systems (CSES) Integrated Module Dataset (IMD) Stimulus Paper and on the CSES website.