The Democracy Index is an index compiled by the Economist Intelligence Unit (EIU), the research division of the Economist Group, a UK-based private company which publishes the weekly newspaper The Economist. Akin to a Human Development Index but centrally concerned with political institutions and freedoms, the index attempts to measure the state of democracy in 167 countries and territories, of which 166 are sovereign states and 164 are UN member states. The index is based on 60 indicators grouped in 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. Methodology As described in the report, the Democracy Index produces a weighted average based on the answers to 60 questions, each one with either two or three permitted 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. The questions are grouped into five categories: electoral process and pluralism civil liberties functioning of government political participation political culture Each answer is converted to a score, either 0 or 1, or for the three-answer questions, 0, 0.5 or 1. With the exceptions mentioned below, within each category, the scores are added, multiplied by ten, and divided by the total number of questions within the category. There are a few modifying dependencies, which are explained much more precisely than the main rule procedures. In a few cases, an answer yielding zero for one question voids another question; e.g. if the elections for the national legislature and head of government are not considered free (question 1), then the next question, "Are elections... fair?", is not considered, but automatically scored zero. Likewise, there are a few questions considered so important that a low score on them yields a penalty on the total score sum for their respective categories, namely: "Whether national elections are free and fair"; "The security of voters"; "The influence of foreign powers on government"; "The capability of the civil servants to implement policies". The five category indices, which are