'Computes the measure of dispersion.
The minimum of the standard deviation and interquartile range / 1.349
References
See the user guide for the np package in R.
In the notes on bwscaling option in npreg, npudens, npcdens there is
a discussion on the measure of dispersion'

def _compute_dispersion(self, data):

    data = data[:, 1:]
    return _compute_min_std_IQR(data)
