{{alias}}( k )
    Returns the excess kurtosis of a chi distribution.

    If provided `NaN` as any argument, the function returns `NaN`.

    If provided `k <= 0`, the function returns `NaN`.

    Parameters
    ----------
    k: number
        Degrees of freedom.

    Returns
    -------
    out: number
        Excess kurtosis.

    Examples
    --------
    > var v = {{alias}}( 9.0 )
    ~0.011
    > v = {{alias}}( 1.5 )
    ~0.424

    See Also
    --------