Measuring the similarity between words, sentences, paragraphs and documents is an important research and discussion space in various discussions such as information search, document grouping, word-sense disambiguation, automatic essay scoring, short answer assessment, machine translation and text summarization. This article discus a survey which discussing methods for measuring the similarity of text or strings. This article is structred into three approaches; String-based, corpus-based, and knowledge-based similarity measures and presents the combinations of these similarities measures.
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