tetrachoricadj.
/tɛtrəˈkɔːrɪk/ Statistics.
Applied to a table in which data are divided into two according to each of two criteria, and so having four subdivisions; of or pertaining to such a table; applied esp. to an estimate of the product-moment coefficient derived from such a table, and to concepts used in obtaining such an estimate.
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the world > relative properties > number > probability or statistics > [adjective] > relating to grouping > spec statistical table
tetrachoric1910
polychoric1918
1910 P. F. Everitt in Biometrika 7 438 In the present tables the values of the first six τ functions, henceforth to be termed tetrachoric functions, have been computed for values of ½ (1 − α) from ·001 to ·500 by successive increments of ·001.
1918 Biometrika 12 95 In the ordinary scheme for a tetrachoric table, the quadrants are denoted by a, b, c, d.
1943 M. G. Kendall Adv. Theory Statistics I. xiv. 354 Tetrachoric r and biserial η. Both these coefficients are, in effect, estimates of a putative product-moment correlation for data which are not specified with the detail of an ordinary bivariate table.
1956 J. Whatmough Lang. 241 The statistical method of the so-called ‘tetrachoric R’..is valuable in revealing the degree of correlation..between languages which may be suspected of being historically akin.
1964 Psychometrika 29 386 The tetrachoric series method is generalized to produce a new polychoric estimate of ρ.
This entry has not yet been fully updated (first published 1986; most recently modified version published online June 2018).
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adj.1910