Greenberg relied on his own method of mass comparison of vocabulary items rather than the comparative method of demonstrating regular sound correspondences to establish the family.
ɡɹˈiːnbɜːɡ ɹᵻlˈaɪd ˌɔn hɪz ˈoʊn mˈɛθəd ʌv mˈæs kəmpˈæɹɪsən ʌv voʊkˈæbjʊlˌɛɹi ˈaɪɾəmz ɹˈæðɚ ðɐn ðə kəmpˈæɹətˌɪv mˈɛθəd ʌv dˈɛmənstɹˌeɪɾɪŋ ɹˈɛɡjʊlɚ sˈaʊnd kˌɔːɹɪspˈɑːndənsᵻz tʊ ɪstˈæblɪʃ ðə fˈæmɪli.