The Democracy Index published by the Economist Group is an index measuring the quality of democracy across the world. This quantitative and comparative assessment is centrally concerned with democratic rights and democratic institutions. The methodology for assessing democracy used in this democracy index is according to Economist Intelligence Unit which is part of the Economist Group, a UK-based private company, which publishes the weekly newspaper The Economist. The index is based on 60 indicators grouped into five categories, measuring pluralism, civil liberties, and political culture. In addition to a numeric score and a ranking, the index categorizes each country into one of four regime types: full democracies, flawed democracies, hybrid regimes, and authoritarian regimes. The first Democracy Index report was published in 2006. Reports were published every two years until 2010 and annually thereafter. The index includes 167 countries and territories, of which 166 are sovereign states and 164 are UN member states. Other democracy indices with similar assessments of the state of democracy include V-Dem Democracy indices or Bertelsmann Transformation Index.