Module « scipy.stats »

Fonction tiecorrect - module scipy.stats

Signature de la fonction tiecorrect

def tiecorrect(rankvals) 

Description

tiecorrect.__doc__

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 `~scipy.stats.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