Formulas and a FORTRAN program for computing Kendall's tau as well as a generalized Spearman rho coefficient from ordered contingency tables are described. Relative advantages and disadvantages of tau and rho as measures of association are considered. The program can be used for analyzing ranked data from many subjects on two variables or for comparing the responses of one subject with the correct responses to an ordered multicategory item.
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Glass, G. V. and Stanley, J. C.Statistical methods in education and psychology. Englewood Cliffs, N.J.: Prentice-Hall, 1970.
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Kendall, M. G.Rank correlation methods (4th ed.). London: Charles Griffin, 1970.