Kendall's tau with a blocking variable.
Kendall's rank correlation tau between two variables, in the presence of a third blocking variable, is defined. An estimator of the common tau within the blocks is used to test conditional independence of the two variables, given the blocking variable. An application is presented.
D001699:Biometry; D006801:Humans; D007694:Killer Cells, Natural / Q000528:radiation effects; D009689:Nuclear Warfare; D011829:Radiation Dosage; D011832:Radiation Injuries / Q000276:immunology / Q000401:mortality