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1662: Concept exists at least since then in mortality tables of J. Graunt
1786: Bar charts introduced by W. Playfair to capture Scottish imports/exports
1833: Histograms introduced by A. M. Guerry as discrete approximations to distribution functions
1859: Florence Nightingale used them to compare mortality of soldiers and civilians
Word `histogram’ of Greek origin
`histo-s’ = `mast’ (arrangement of spars, erected more or less vertically on the centre-line of a ship or boat.)
`gram-ma’ = `something written’
Introduced by Karl Pearson in 1892 for a “common form of graphical representation”
Numerical
Continous Data
(measured)
Descriptive
Discrete Data
(counted)
Reference:
Yahnnis Ioannidis -University of Athens, Hellas
https://www.mathsisfun.com