 For example, Wiercinski states that the colossal Olmec heads represent the "Dongolan" type.The empirical frequencies of the Dongolan type at Tlatilco calculated by Wiercinski was 0.231, more than twice as high as Wiercinski's theoretical figure of 0.101, for the presence of Dongolans at Tlatilco.Wiercinski summarizes his research by offering the following "ethnogenetical hypotheses"