Psephology (sᵻˈfɒlədʒi; from Greek psephos) is the "quantitative analysis of elections and balloting", a technique within the branch of political science known as political methodology. Psephology attempts to explain elections using the scientific method and is related to political forecasting.
Psephology uses historical precinct voting data, public opinion polls, campaign finance information and similar statistical data. The term was coined in 1948 in the United Kingdom by W. F. R. Hardie (1902–1990) after he was asked by his friend R. B. McCallum for a word to describe the study of elections; first written use in 1952. Social choice theory is a different field of study that studies voting from a mathematical perspective.
'Psephology' as a term is more common in Britain and in those English-speaking communities that rely heavily on the British standard of the language.
The term draws from the Greek word for pebble as the ancient Greeks used pebbles to vote. (Similarly, the word ballot is derived from the medieval French word "ballotte," meaning a small ball).
Psephology is a division of political science that deals with the examination as well as the statistical analysis of elections and polls. People who practice psephology are called psephologists.
A few of the major tools that are used by a psephologist are historical precinct voting data, campaign finance information, and other related data. Public opinion polls also play an important role in psephology. Psephology also has various applications specifically in analysing the results of election returns for current indicators, as opposed to predictive purposes. For instance, the Gallagher Index measures the amount of proportional representation in an election.
Degrees in psephology are not offered (instead, a psephologist might have a degree in political science and/or statistics). Knowledge of demographics, statistical analysis and politics (especially electoral systems and voting behaviour) are prerequisites for becoming a psephologist.
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Political forecasting aims at forecasting the outcomes of political events. Political events can be a number of events such as diplomatic decisions, actions by political leaders and other areas relating to politicians and political institutions. The area of political forecasting concerning elections is highly popular, especially amongst mass market audiences. Political forecasting methodology makes frequent use of mathematics, statistics and data science. Political forecasting as it pertains to elections is related to psephology.
An electoral system or voting system is a set of rules that determine how elections and referendums are conducted and how their results are determined. Electoral systems are used in politics to elect governments, while non-political elections may take place in business, non-profit organisations and informal organisations. These rules govern all aspects of the voting process: when elections occur, who is allowed to vote, who can stand as a candidate, how ballots are marked and cast, how the ballots are counted, how votes translate into the election outcome, limits on campaign spending, and other factors that can affect the result.
Nathaniel Read Silver (born January 13, 1978) is an American statistician, writer, and poker player who analyzes baseball (see sabermetrics), basketball, and elections (see psephology). He is the founder of FiveThirtyEight, and held the position of editor-in-chief there, along with being a special correspondent for ABC News, until May 2023. Silver was named one of the world's 100 most influential people by Time in 2009 after an election forecasting system he developed successfully predicted the outcomes in forty-nine of the fifty states in the 2008 U.