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a -- ratio of quantity in time-scale ---c[Rate]
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==Origin of terminology==
===Why is it called "''Z''"?===
===Why is it called "''Student's t''"?===
William Gosset was a mathematician around the 19th to 20th century as well as he worked for the famous brewery Guinness. [https://www.geo.fu-berlin.de/en/v/soga/Basics-of-statistics/Continous-Random-Variables/Students-t-Distribution/index.html He found a new statistical distribution but Guinness did not allow their employees to publish any papers related to their business confidential affairs. Thus Gosset published his achievement under a nickname of ''Student''].
[https://www.jstor.org/stable/2683058 ''t'' itself was later named through correspondences between Gosset and a statistician R.A. Fisher]. The first description of ''t'' is appeared on [https://digital.library.adelaide.edu.au/dspace/bitstream/2440/15183/1/36.pdf the article by Fisher in 1924].
===Why is it called "''regression''"?===
In the 19th century, Sir Francis Galton investigated association between parents' heights and their offspring's heights. He found association between them had some characteristics that the higher the parents were the higher the offspring are but the offspring tended to shorter than their parents, and vise versa. [https://www.biostat.jhsph.edu/courses/bio653/misc/JMPer%20Cable%20Summer%2098%20Why%20is%20it%20called%20Regression.htm He described the association as 'offspring's heights to ''regress'' (go back) towards mediocrity (average)'].
Since then [https://www.sciencedirect.com/science/article/abs/pii/S0039368120302090 ''regression to the mean''] has expanded to the regression model which provides the estimates of association between one dependent variable and one or more independent variables by a line.
===Why is it called "''logistic''"?===
