Help ! Grammar correction wanted

0Hello there, can any one help me to correct this essay? thanks.02br
02br
00 Computational linguistics (CL) or natural language processing (NLP) is risen in the02br
00information technology revolution recently. In computational linguistics or natural lan-02br
00guage processing, appraisal is also known as sentiment analysis. Digital text's sentiment02br
00analysis is automated performed by computer program.02br
02br
00Peter Turney [35] analyzed sentiment in movie reviews by measuring the average se-02br
00mantic orientation of selected two-word phrases in the documents. The semantic orienta-02br
00tion of phrases is based on the semantic orientation of single words. Hatzivassiloglou [34]02br
00reveals the semantic orientation relationship between conjunction and adjective. The02br
00authors explored adjectives' semantic orientation by examining conjunction between ad-02br
00jectives and adopting a clustering algorithm. Some adjectives with positive or negative02br
00semantic orientation are pre-selected. In a given text, a pair of conjoined adjectives are02br
00indicated with the same or di®erent semantic orientation according to their conjunction.02br
00The semantic orientation is identi¯ed by assigning these adjectives to the pre-selected02br
00adjectives groups.02br
00Pointwise Mutual Information (PMI) [51] is an algorithm based on co-occurrence for02br
00measuring two words co-occurrence's degree [52], which can be denoted by a score. Its02br
00principle is \a word is characterized by the company it keeps [53] (pp.27)". This principle02br
00can be expressed by a equation: score(word1;word2) = log202br
00(p(word1&word2)02br
00(p(word1)p(word2))) . Where02br
00p(word1&word2) is probability of word1 and word2 co-appear. p(word1) and p(word2)02br
00are probabilities that they appear separately.0-