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↑See Italica 1950: 46 (cf. [1] and [2]): “Pei, Mario A. "A New Methodology for Romance Classification." Word, v, 2 (Aug. 1949), 135–146. Demonstrates a comparative statistical method for determining the extent of change from the Latin for the free and checked accented vowels of French, Spanish, Italian, Portuguese, Rumanian, Old Provençal, and Logudorese Sardinian. By assigning 3½ change points per vowel (with 2 points for diphthongization, 1 point for modification in vowel quantity, ½ point for changes due to nasalization, palatalization or umlaut, and −½ point for failure to effect a normal change), there is a maximum of 77 change points for free and checked stressed vowel sounds (11×2×3½=77). According to this system (illustrated by seven charts at the end of the article), the percentage of change is greatest in French (44%) and least in Italian (12%) and Sardinian (8%). Prof. Pei suggests that this statistical method be extended not only to all other phonological, but also to all morphological and syntactical, phenomena.”
↑See Koutna et al. (1990: 294): “In the late forties and in the fifties some new proposals for classification of the Romance languages appeared. A statistical method attempting to evaluate the evidence quantitatively was developed in order to provide not only a classification but at the same time a measure of the divergence among the languages. The earliest attempt was made in 1949 by Mario Pei (1901–1978), who measured the divergence of seven modern Romance languages from Classical Latin, taking as his criterion the evolution of stressed vowels. Pei's results do not show the degree of contemporary divergence among the languages from each other but only the divergence of each one from Classical Latin. The closest language turned out to be Sardinian with 8% of change. Then followed Italian — 12%; Spanish — 20%; Romanian — 23,5%; Provençal — 25%; Portuguese — 31%; French — 44%.”