Correction highlights inaccuracies in visual data representation for improved understanding of English grammar.
A correction should be made in William Labov’s article, ‘Contraction, deletion, and inherent variability of the English copula’ (Lg. vol. 45, p. 749) : in Figure 12, the symbols + NP and — NP are to be reversed. In addition, in the caption for Figure 12, rule 9’ should be changed to rule 10’.
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