# scipy.stats.tiecorrect

scipy.stats.tiecorrect(rankvals)

  Tie correction factor for Mann-Whitney U and Kruskal-Wallis H tests.

  Parameters:
    rankvals array_like

      A 1-D sequence of ranks. Typically this will be the array returned by `rankdata`.

  Returns:
    factor float

      Correction factor for U or H.

  See also

  `rankdata`

    Assign ranks to the data

  `mannwhitneyu`

    Mann-Whitney rank test

  `kruskal`

    Kruskal-Wallis H test

  References

  [1]

  Siegel, S. (1956) Nonparametric Statistics for the Behavioral Sciences. New York: McGraw-Hill.

  Examples

      >>> from scipy.stats import tiecorrect, rankdata
      >>> tiecorrect([1, 2.5, 2.5, 4])
      0.9
      >>> ranks = rankdata([1, 3, 2, 4, 5, 7, 2, 8, 4])
      >>> ranks
      array([ 1. ,  4. ,  2.5,  5.5,  7. ,  8. ,  2.5,  9. ,  5.5])
      >>> tiecorrect(ranks)
      0.9833333333333333