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A hedonometer or hedonimeter is a device used to gauge happiness or pleasure. Conceived of at least as early as 1880,[1] the term was used in 1881 by the economist Francis Ysidro Edgeworth to describe "an ideally perfect instrument, a psychophysical machine, continually registering the height of pleasure experienced by an individual."[2]

More recently, it has been used to refer to a tool developed by Peter Dodds and Chris Danforth to gauge the valence of various corpora, including historical State of the Union addresses, song lyrics, and online tweets and blogs.[3][4][5] A version of the tool is available at hedonometer.org, which they call a sort of "Dow Jones Index of Happiness",[6] and hope will be used by government officials in conjunction with other metrics as a gauge of the population's well-being.[7]

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