Ozr
2024-04-14 13:40TF和DF的區(qū)別是? TF好像有at sentence level/corpus level/collection level?
所屬:CFA Level II > Quantitative Methods 視頻位置 相關(guān)試題
來(lái)源: 視頻位置 相關(guān)試題
1個(gè)回答
Huang助教
2024-04-15 00:18
該回答已被題主采納
同學(xué)你好,
TF at the corpus level = the number of times a given word appears in the whole corpus/the total number of words in the corpus
TF at sentence level=Word Count In Sentence/Total Words In Sentence
DF = Sentence Count With Word / Total number of sentences.
TF是某個(gè)詞的頻率,分母都是total number of words,
DF是包括某個(gè)詞的句子出現(xiàn)的頻率,分母是Total number of sentences。
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