
{{alias}}( α, β )
    Returns the excess kurtosis of an inverse gamma distribution.

    If `α <= 4` or `β <= 0`, the function returns `NaN`.

    If `α` or `β` is `NaN`, the function returns `NaN`.

    Parameters
    ----------
    α: number
        Shape parameter.

    β: number
        Rate parameter.

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

    Examples
    --------
    > var v = {{alias}}( 7.0, 5.0 )
    12.0
    > v = {{alias}}( 6.0, 12.0 )
    19.0
    > v = {{alias}}( 8.0, 2.0 )
    ~8.7

    See Also
    --------

