'High quality' in text mining usually refers to some combination of relevance, novelty, and interest. Text mining usually involves the process of structuring the input text (usually parsing, along with the addition of some derived linguistic features and the removal of others, and subsequent insertion into a database), deriving patterns within the structured data, and finally evaluation and interpretation of the output. (2005) we can differ three different perspectives of text mining: information extraction, data mining, and a KDD (Knowledge Discovery in Databases) process. High-quality information is typically obtained by devising patterns and trends by means such as statistical pattern learning. It involves "the discovery by computer of new, previously unknown information, by automatically extracting information from different written resources." Written resources may include websites, books, emails, reviews, and articles. Text mining, also referred to as text data mining, similar to text analytics, is the process of deriving high-quality information from text. Process of analysing text to extract information from it
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