def davies_pvalue(q, w):
    r"""Joint significance of statistics derived from chi2-squared distributions.

    Parameters
    ----------
    q : float
        Test statistics.
    w : array_like
        Weights of the linear combination.

    Returns
    -------
    float
        Estimated p-value.
    """

    q = asarray(atleast_1d(q), float)
    w = asarray(w, float)

    re = _pvalue_lambda(_lambda(w), q)
    param = dict()
    param["liu_pval"] = re["p_val_liu"][0]
    param["Is_Converged"] = re["is_converge"][0]

    return re["p_value"][0]
r"""Joint significance of statistics derived from chi2-squared distributions.

    Parameters
    ----------
    q : float
        Test statistics.
    w : array_like
        Weights of the linear combination.

    Returns
    -------
    float
        Estimated p-value.