def hist(self):
        """Draw normed histogram of the data using :attr:`bins`

        .. plot::

            >>> from scipy import stats
            >>> data = stats.gamma.rvs(2, loc=1.5, scale=2, size=20000)
            >>> # We then create the Fitter object
            >>> import fitter
            >>> fitter.Fitter(data).hist()

        """
        _ = pylab.hist(self._data, bins=self.bins, density=True)
        pylab.grid(True)