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Table 1 PCC of ESA based on the number of index documents (Anderka and Stein 2009)

From: Econo-ESA in semantic text similarity

Index collection Number of index documents
  1,000 10,000 50,000 100,000 150,000 200,000
Wikipedia TFIDF 0.742 0.784 0.782 0.782 0.781 0.781