
{{alias}}( a, b )
    Returns the standard deviation of a Kumaraswamy's double bounded
    distribution.

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

    If `a <= 0` or `b <= 0`, the function returns `NaN`.

    Parameters
    ----------
    a: number
        First shape parameter.

    b: number
        Second shape parameter.

    Returns
    -------
    out: number
        Standard deviation.

    Examples
    --------
    > var v = {{alias}}( 1.0, 1.0 )
    ~0.289
    > v = {{alias}}( 4.0, 12.0 )
    ~0.13
    > v = {{alias}}( 16.0, 8.0 )
    ~0.062

    See Also
    --------

