Accounting For Ties
A pair {(xi, yi), (xj, yj)} is said to be tied if xi = xj or yi = yj; a tied pair is neither concordant nor discordant. When tied pairs arise in the data, the coefficient may be modified in a number of ways to keep it in the range :
Read more about this topic: Kendall Tau Rank Correlation Coefficient
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—Michel de Montaigne (1533–1592)
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—Karl Liebknecht (1871–1919)
“Ties of blood are not always ties of friendship; but friendship founded on merit, on esteem, and on mutual trust, becomes more vital and more tender when strengthened by the ties of blood.”
—Philip Dormer Stanhope, 4th Earl Chesterfield (1694–1773)