"The Index of Public Integrity (IPI) aims to capture a snapshot of this balance in 114 countries for which data is available. It is a composite index consisting of six components. For the 2015, 2017 and 2019 editions, the components were: administrative burden, trade openness, budget transparency for opportunities, and judicial independence, e-citizenship and freedom of the press for constraints.
Starting from the 2021 edition, administrative burden and trade openness have been replaced by administrative transparency and online services due to unavailable alternative data on the original components (based on the World Bank Doing Business project, which closed). Please see the page of the original source for more detailed information about the methodology of this index.
A more extensive explanation of the methodology and the original composition of the IPI can be found in the following peer-reviewed publication:
Measuring Control of Corruption by a New Index of Public Integrity – Mungiu-Pippidi, A., Dadašov, R. Measuring Control of Corruption by a New Index of Public Integrity. European Journal on Criminal Policy Research 22, 415–438 (2016)."