def dissemination(self) -> np.array:
        '''
        Returns the dissemination metric D_w from Altmann et al. 2011

        Altmann EG, Pierrehumbert JB, Motter AE (2011) Niche as a Determinant of Word Fate in Online
        Groups. PLoS ONE 6(5): e19009. https://doi.org/10.1371/journal.pone.0019009.
        '''
        U_w, Utilde_iw = self.__dissemination_components()

        # Ratio of number of users using word and expected number of users using word
        return (U_w / Utilde_iw.sum(axis=0).A1).A1

        Returns the dissemination metric D_w from Altmann et al. 2011

        Altmann EG, Pierrehumbert JB, Motter AE (2011) Niche as a Determinant of Word Fate in Online
        Groups. PLoS ONE 6(5): e19009. https://doi.org/10.1371/journal.pone.0019009.
        
scattertext/dispersion/dispersion.py