prints results of hotellings T2

def summary(self):
        """ prints results of hotellings T2 """
        transform = self._catalog_object._transform
        if   transform == 'time':
            self._hotellings_time()
        elif transform == 'fourier':
            self._hotellings_fourier()
        elif transform == 'spectrogram':
            self._hotellings_spectrogram()
        elif transform == 'amplitude':
            self._hotellings_amplitude()
        elif transform == 'phase':
            self._hotellings_phase()
        else:
            raise ValueError("Unknown catalog transformation")
        # print out to terminal
        self._make_summary_tables()