# Concordant pair

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In statistics, a ** concordant pair** is a pair of a two-variable (bivariate) observation data-set **X**_{1},**Y**_{1}} and {**X**_{2},**Y**_{2}}, where:

Correspondingly, a ** discordant pair** is a pair, as defined above, where

and the sign function, often represented as **sgn**, is defined as:

## See also

## References

- Kendall rank correlation.
- Kendall, M. (1948)
*Rank Correlation Methods*, Charles Griffin & Company Limited - Kendall, M. (1938) "A New Measure of Rank Correlation", Biometrica, 30, 81-89.

## External links

{{enWP|Concordant pair}