Editing Histogram (section)

==Etymology==
The term "histogram" was first introduced by [[Karl Pearson]], the founder of mathematical [[statistics]], in lectures delivered in [[1892 (year)|1892]] at [[University College London]]. Pearson's term is sometimes incorrectly said to combine the Greek root ''γραμμα'' (gramma) = "figure" or "drawing" with the root ''ἱστορία'' (historia) = "inquiry" or "history". Alternatively the root ''ἱστίον'' (histion) is also proposed, meaning "web" or "tissue" (as in [[histology]], the study of biological tissue). Both of these [[etymology|etymologies]] are incorrect, and in fact Pearson, who knew Ancient Greek well, derived the term from a different if [[homophone|homophonous]] Greek root, ''ἱστός'' = "something set upright", "mast", referring to the vertical bars in the graph. Pearson's new term was embedded in a series of other analogous [[neologisms]], such as "stigmogram" and "radiogram".<ref name = "Rufi">Daniel Riaño Rufilanchas (2017), [https://www.researchgate.net/profile/Daniel-Riano/publication/363226799_On_the_origin_of_Karl_Pearson's_term_histogram/links/631200571ddd4470212cfeae/On-the-origin-of-Karl-Pearsons-term-histogram.pdf "On the origin of Karl Pearson’s term 'histogram'"], ''Estadística Española'' vol. 59, no. 192, p. 29-35.</ref> 

Pearson himself noted in 1895 that although the term "histogram" was new, the type of graph it designates was "a common form of graphical representation".<ref>{{Cite journal| first1 = K. | last1 = Pearson |author-link=Karl Pearson| title = Contributions to the Mathematical Theory of Evolution. II. Skew Variation in Homogeneous Material| journal = Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences| volume = 186| pages = 343–414| year = 1895| doi = 10.1098/rsta.1895.0010|bibcode = 1895RSPTA.186..343P | url = https://zenodo.org/record/1432104| doi-access = free}}</ref>
In fact the technique of using a bar graph to represent statistical measurements was devised by the Scottish [[economist]], [[William Playfair]], in his ''Commercial and political atlas'' (1786).<ref name = "Rufi"/>