Talk:Kendall tau rank correlation coefficient
From Wikipedia, the free encyclopedia
[edit] Error in explanation
The last paragraph of the definition has a problem: it says
- P can also be interpreted as the number of concordant pairs subtracted by the number of discordant pairs.
This can't be literally true: P (as defined above) is a positive number, while this subtraction doesn't have to be.
Instead, while tau = 2P/N-1 (when N=n*(n-1)/2)), if we write S="number of concordant pairs subtracted by the number of discorant pairs", I think that tau = S/N, so that we have S=(2P-N).
Or am I missing something?
[edit] Example
shouldn't the example be P = 5 + 4 + 4 + 4 + 3 + 1 + 0 + 0 = 22. instead of P = 5 + 4 + 5 + 4 + 3 + 1 + 0 + 0 = 22?
Sboehringer 17:00, 5 March 2007 (UTC)
