
Democracy-Dictatorship (DD), index of democracy and dictatorship
or simply the DD index
or the DD datasets was the binary measure of
democracy
Democracy (from , ''dēmos'' 'people' and ''kratos'' 'rule') is a form of government in which political power is vested in the people or the population of a state. Under a minimalist definition of democracy, rulers are elected through competitiv ...
and
dictatorship
A dictatorship is an autocratic form of government which is characterized by a leader, or a group of leaders, who hold governmental powers with few to no Limited government, limitations. Politics in a dictatorship are controlled by a dictator, ...
whose publication stopped in 2008. Originally proposed by
Adam Przeworski
Adam Przeworski (; born May 5, 1940) is a Polish-American professor of political science specializing in comparative politics. He is Carroll and Milton Professor Emeritus in the Department of Politics of New York University. He is a scholar of dem ...
, and further developed and maintained by Cheibub, Gandhi, and Vreeland.
Based on the regime binary classification idea proposed by Alvarez in 1996, and the Democracy and Development (or DD measure, ACLP dataset) proposed by Przeworski, Cheibub, Gandhi, and Vreeland developed a six-fold regime classification scheme, resulting what the authors called as the DD datasets.
The DD dataset covers the annual data points of 199 countries from 1946 (or date of independence) to 2008. The figures at the left show the results in 1988 and 2008.
Six-fold regime classification scheme and its rules
The DD index first classifies the regimes into two types: democracies and dictatorships. For democracies, it categorizes them into three types:
parliamentary
In modern politics and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: Representation (politics), representing the Election#Suffrage, electorate, making laws, and overseeing ...
,
semi-presidential
A semi-presidential republic, or dual executive republic, is a republic in which a president exists alongside a prime minister and a cabinet, with the latter two being responsible to the legislature of the state. It differs from a parliamen ...
and
presidential democracies. For dictatorships,
monarchic,
military
A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. Militaries are typically authorized and maintained by a sovereign state, with their members identifiable by a d ...
and
civilian dictatorship
A dictatorship is an autocratic form of government which is characterized by a leader, or a group of leaders, who hold governmental powers with few to no limitations. Politics in a dictatorship are controlled by a dictator, and they are facil ...
.
"
Based on a "minimalist" theory of democracy, the index relies on rules regarding the existence of competitive elections.
Resorting to democratic concepts by
Karl Popper
Sir Karl Raimund Popper (28 July 1902 – 17 September 1994) was an Austrian–British philosopher, academic and social commentator. One of the 20th century's most influential philosophers of science, Popper is known for his rejection of the ...
and
Joseph Schumpeter
Joseph Alois Schumpeter (; February 8, 1883 – January 8, 1950) was an Austrian political economist. He served briefly as Finance Minister of Austria in 1919. In 1932, he emigrated to the United States to become a professor at Harvard Unive ...
, Przeworski defended the minimalist approach, citing Popper that "the only system in which citizens can get rid of governments without bloodshed."
Four rules
For a regime to be considered as a democracy by the DD scheme, it must meet the requirement of four rules below:
Some regimes may meet the first three rules, but lack an alternation in power in its historical past; these regimes are classified as dictatorships because of cases where the incumbent only allows elections as long as they keep winning, and would refuse to step down if they lost. However, since they might also give up power willingly, the regime is marked with a
type II value to signal potential classification errors where a democratic regime may be falsely classified as dictatorship.. This does not indicate cases of semi-democracy or semi-dictatorship.. The authors acknowledged that the last rule is more complicated to implement, but stated that it helps researchers to control potential errors and removes subjective judgement from the classification.
Countries
The Democracy-Dictatorship Index has the main regime types of "democracy" and "dictatorship" and three sub-types for each as well. Democracies can be either
parliamentary
In modern politics and history, a parliament is a legislative body of government. Generally, a modern parliament has three functions: Representation (politics), representing the Election#Suffrage, electorate, making laws, and overseeing ...
,
semi-presidential
A semi-presidential republic, or dual executive republic, is a republic in which a president exists alongside a prime minister and a cabinet, with the latter two being responsible to the legislature of the state. It differs from a parliamen ...
, or
presidential and dictatorships can be civilian, military, or royal. Many countries which are seen as otherwise democratic are dictatorships because there has yet to be an alternation in power since their incumbent government has never lost an election. Therefore, it is impossible to know if the regime is a democracy or a dictatorship, so DD Index considers them dictatorships until an alternation in power occurs.
Democracy classification

Democracies are classified by the rules in which executives can be appointed or removed and can be either presidential, mixed or semi-presidential, or parliamentary.
It is important to note that these names do not have to correspond to the official or colloquial titles of any of the countries offices. For example, DD could classify a country which has a legislative assembly whose official name is "the parliament" but still classify it in any of the three categories. The classification depends on the rules outlining the relationship between a country's government, legislative assembly (often called the legislature), and head of state. The government composes the chief executive and the heads of the executive departments. The chief executive can take many titles including
chancellor
Chancellor () is a title of various official positions in the governments of many countries. The original chancellors were the of Roman courts of justice—ushers, who sat at the (lattice work screens) of a basilica (court hall), which separa ...
,
prime minister
A prime minister or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but r ...
, or
premier
Premier is a title for the head of government in central governments, state governments and local governments of some countries. A second in command to a premier is designated as a deputy premier.
A premier will normally be a head of govern ...
and the heads of the executive departments can bear different titles and be called different things. In the
United Kingdom
The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Northwestern Europe, off the coast of European mainland, the continental mainland. It comprises England, Scotlan ...
, for example, the chief executive is the
prime minister
A prime minister or chief of cabinet is the head of the cabinet and the leader of the ministers in the executive branch of government, often in a parliamentary or semi-presidential system. A prime minister is not the head of state, but r ...
, and the
ministers are the heads of the executive departments, which together compose the government.
Legislative responsibility
The first distinction made is whether a country has a government has legislative responsibility, i.e. whether a majority vote in the legislature can remove the sitting government without cause. The required majority needed to remove the sitting government varies between countries but is termed a vote of no confidence. Some countries (such as Spain, Belgium, Germany, and Israel) require that the vote of no confidence also specify who is going to replace the sitting government to minimize the time without an interim government, essentially replacing one government with another. This type of vote is termed a constructive vote of no confidence. Sometimes sitting governments will attach a vote of no confidence clause to a piece of legislation they want passed, effectively tying the survival of the government on the piece of legislation.
Head of state
The second distinction made is whether the head of state is popularly elected for a fixed term. The head of state may be
unelected and still be classified as a democracy.
Popularly elected means that the head of state is directly elected by the citizens or elected by an assembly which then elects them (an example being the electoral college in the United States). In Germany, the head of state is elected by regional legislatures and not popularly elected. Elected heads of state are usually referred to as "president." The phrase "fixed term" indicates the once the head of state is chosen, they serve a known and a limited number of years before another election is held, and they cannot be removed from the office in the meantime via a
vote of no confidence
A motion or vote of no confidence (or the inverse, a motion or vote of confidence) is a motion and corresponding vote thereon in a deliberative assembly (usually a legislative body) as to whether an officer (typically an executive) is deemed fi ...
.
The head of state in most parliamentary democracies formally appoint the head of government. Some countries, such as Greece and Bulgaria, stipulate who the head of state chooses as head of government.
In the former, for example, the President must appoint as Prime Minister the leader of the largest party in parliament, who has three days to gain the confidence of a majority thereof.
Some countries,
such as Sweden, instead charge another person entirely with choosing the head of government, such as the presiding officer of the legislative assembly.
Classification
The first distinction made is whether a democracy's government is responsible to the legislature. If it is not responsible, it is a presidential democracy. If it is, then a further distinction is made between democracies where the head of state is popularly elected and those where the head of state is not popularly elected. If the head of state is popularly elected for a fixed term then, the democracy is mixed or semi-presidential. If the head of state serves for life or is not popularly elected or a fixed term, then the democracy is parliamentary.
The table below offers a full list of which countries are what type of democracy. Keep note that the head of state, chief executive, government, and legislatures can have their official names be seemingly contradictory to this classification. The name a democracy gives itself or its office does not indicate what type of democracy it is.
Definitions
A presidential democracy has a government that does not need the majority support of a legislature to stay in power. A semi-presidential (mixed) democracy has a government that needs the majority of support from a legislature to exist and whose head of state is popularly elected for a fixed term. Parliamentary democracy is the same as semi-presidential but has heads of state which are not popularly elected for a fixed term, typically either monarchs or officials not chosen by popular elections.
Comparison with other democracy-measuring data sets
The DD dataset is limited to 199 countries after 1946, whereas Boix, Miller, & Rosato, 2013 proposed a data set from 1800 to 2007, covering 219 countries. The 2010 version of
Polity data series
The Polity data series is a data series in political science research. Along with the V-Dem Democracy Indices project and The Economist Democracy Index, Polity is among prominent datasets that measure democracy and autocracy.
The Polity st ...
covers 189 countries from 1800 to 2009.
Gugiu & Centellas developed the
Democracy Cluster Classification Index that integrates five
democracy indicators (including the DD dataset, Polity dataset), clustering 24 American and 39 European regimes over 30 years.
See also
*
Polity data series
The Polity data series is a data series in political science research. Along with the V-Dem Democracy Indices project and The Economist Democracy Index, Polity is among prominent datasets that measure democracy and autocracy.
The Polity st ...
References
External links
DD dataset and citations
ACLP datsset and citations
Przeworski, Alvarez, Cheibub, and Limongi: Democracy and development{{Webarchive, url=https://web.archive.org/web/20140324051646/http://wikisum.com/w/Przeworski,_Alvarez,_Cheibub,_and_Limongi:_Democracy_and_development , date=2014-03-24 From WikiSummary, the Free Social Science Summary Database
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