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Table 3 Three methods to construct keyword dictionaries

From: Research paper classification systems based on TF-IDF and LDA schemes

  Description
Method 1 Using only keywords: top frequency 10, 20, and 30
Method 2 Using only topics by the LDA: topics 10, 20, and 30
Method 3 Combination of Methods 1 and 2: 5 keywords and 5 topics, 10 keywords and 10 topics, and 15 keywords and 15 topics