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Dear CSES User Community,

We are delighted to announce the release of Phase 3 of the CSES Integrated Module Dataset (IMD), which is now available for download on the CSES website ( on the “CSES Integrated Module Dataset (IMD)” page under “Download Data”. A non-comprehensive list of changes made since the last release can be found using the Errata link on that same page.

The IMD brings together select variables from CSES Modules 1-4 into one unified, harmonized dataset. The current version of the IMD contains data on 281,083 respondents from 55 polities, covering 174 elections over the period 1996-2016. This dataset includes 389 variables including like-dislike, left-right, and leader measures for more than 600 parties.

Over 60 new derivative, data bridging, and demographic variables have been added as of this release. Among other innovations, CSES IMD includes harmonized numerical party/coalition codes within polities across CSES modules, within-dataset labels for all parties/coalitions, and an incumbent vote choice variable. The Phase 3 release includes several improvements to the data and documentation, including a new codebook appendix containing detailed information about the alphabetical (relational) data in CSES and how to use this along with the harmonized numerical data.

As this is a work in progress, some errors may still be present and we would appreciate being notified of any errors or suggestions by email to:

We hope that users will find this dataset and documentation helpful to their work.

Thank you for your support of the CSES!