As described in the report, the democracy index is a weight...wikipedia - 10 Sep 2020
As described in the report, the democracy index is a weighted average based on the answers of 60 questions, each one with either two or three permitted alternative answers. Most answers are experts' assessments. Some answers are provided by public-opinion surveys from the respective countries. In the case of countries for which survey results are missing, survey results for similar countries, and expert assessments are used in order to fill in gaps.