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Sentiment analysis (SA) extracts and aggregates users\u2019 sentiments towards a target entity. Machine learning (ML) techniques are frequently used as the natural language data is in abundance and has definite patterns. ML techniques adapt to domain specific solution at high accuracy depending upon the feature set used. The lexicon-based techniques, using external dictionary, are independent of data to prevent overfitting but they miss context too in specialized domains. Corpus-based statistical techniques require large data to stabilize. Complex network based techniques are highly resourceful, preserving order, proximity, context and relationships. Recent applications developed incorporate the platform specific structural information i.e. meta-data. New sub-domains are introduced as influence analysis, bias analysis, and data leakage analysis. The nature of data is also evolving where transcribed customer-agent phone conversation are also used for sentiment analysis. This paper reviews sentiment analysis techniques and highlight the need to address natural language processing (NLP) specific open challenges. Without resolving the complex NLP challenges, ML techniques cannot make considerable advancements. The open issues and challenges in the area are discussed, stressing on the need of standard datasets and evaluation methodology. It also emphasized on the need of better language models that could capture context and proximity.<\/jats:p>","DOI":"10.1186\/s40294-016-0016-9","type":"journal-article","created":{"date-parts":[[2016,2,3]],"date-time":"2016-02-03T01:50:42Z","timestamp":1454464242000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":75,"title":["Sentiment analysis and the complex natural language"],"prefix":"10.1186","volume":"4","author":[{"given":"Muhammad Taimoor","family":"Khan","sequence":"first","affiliation":[]},{"given":"Mehr","family":"Durrani","sequence":"additional","affiliation":[]},{"given":"Armughan","family":"Ali","sequence":"additional","affiliation":[]},{"given":"Irum","family":"Inayat","sequence":"additional","affiliation":[]},{"given":"Shehzad","family":"Khalid","sequence":"additional","affiliation":[]},{"given":"Kamran Habib","family":"Khan","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2016,2,3]]},"reference":[{"key":"16_CR1","doi-asserted-by":"crossref","unstructured":"Akkaya Cem, Janyce Wiebe, Rada Mihalcea (2009) Subjectivity word sense disambiguation. 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