introduction to sentiment analysis

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An Introduction to Sentiment Analysis Jaganadh G Text Analytics Consultant http://jaganadhg.in [email protected] 5th Jan 2013 Jaganadh G An Introduction to Sentiment Analysis

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An Introduction to Sentiment Analysis

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Page 1: Introduction to Sentiment Analysis

An Introduction to Sentiment Analysis

Jaganadh GText Analytics Consultant

http://[email protected]

5th Jan 2013

Jaganadh G An Introduction to Sentiment Analysis

Page 2: Introduction to Sentiment Analysis

About me !!

Software Engineer Specializing in Text Analytics Research& Development

When free, teaches Python, Speaks about FOSS andblogs athttp://jaganadhg.in

Working as Big Data Specialist for a Fortune 500Company

I am a computational linguist / Linguist and Indologist,Book reviewer

Maters Degree Holder in Sanskrit from University ofKerala

Jaganadh G An Introduction to Sentiment Analysis

Page 3: Introduction to Sentiment Analysis

Introduction

Web Today

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Sentiment

Picture Courtesy: http://webanalysis.blogspot.com/2011/09/sentiment-indicator-social-media-kpi.html

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

What other people think!!!

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Friends and Family

Picture Courtesy: http://ianvaleza.com/mlm-secrets-warm-market-approach-strategies/

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Survey

Picture Courtesy: http://www.oksociety.in/the-guest-for-legitmate-sites-for-paid-surveys/

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Blogs, Forums, Social Network ....

Picture Courtesy: http://imfoundation.blogspot.com/p/im-forumsblogs.html

Picture Courtesy:http://www.my-social-network.org/

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Issues with blogs and forums

Picture Courtesy: http://www.asunseenontv.com/4-fake-reviews/

Jaganadh G An Introduction to Sentiment Analysis

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Introduction

Now : Sentiment Analysis

Jaganadh G An Introduction to Sentiment Analysis

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What is Sentiment Analysis

Sentiment Analysis

Automated extraction of subjective content from digital textand predicting the subjectivity such as positive or negative.

Jaganadh G An Introduction to Sentiment Analysis

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Subjectivity

Subjectivity

Linguistic expression of somebody’s emotions, opinions,sentiment .......

Picture Courtesy: http://www.asunseenontv.com/4-fake-reviews/

Jaganadh G An Introduction to Sentiment Analysis

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Subjective Text Sources

Social Media

Picture Courtesy: http://www.alchemyuk.com/online marketing/social media marketing.php

Jaganadh G An Introduction to Sentiment Analysis

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Example Review

Nokia Lumia 800

Review Courtesy:http://www.techradar.com/reviews/phones/mobile-phones/nokia-lumia-800-1039101/user-review

Jaganadh G An Introduction to Sentiment Analysis

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The Big Picture

Sentiment Analysis

Jaganadh G An Introduction to Sentiment Analysis

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Basics of Sentiment Analysis

Components of Opinion

Jaganadh G An Introduction to Sentiment Analysis

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Basics of Sentiment Analysis

Opinion Definition

Jaganadh G An Introduction to Sentiment Analysis

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Components of Sentiment Analysis

Components

Jaganadh G An Introduction to Sentiment Analysis

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Approaches

Approaches

Lexicon based

Supervised Learning

Unsupervised Learning

Keyword

Jaganadh G An Introduction to Sentiment Analysis

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Issues and Challenges

Challenges

Picture Courtesy: http://inventionmachine.com/the-Sustainable-Innovation-Blog/bid/51703/Three-Key-Challenges-to-Entering-New-Markets

Jaganadh G An Introduction to Sentiment Analysis

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Issues and Challenges

Challenges

Language

Domain

Spam

Named Entity Identification

Reliable content

Jaganadh G An Introduction to Sentiment Analysis

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Questions ??

Jaganadh G An Introduction to Sentiment Analysis

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References

B. Pang, Lillian Lee Opinion Mining and SentimentAnalysis, Now Publishers Inc, July 2008.

B. Pang, Lillian Lee, S Vaithyanathan Thumbs up?sentiment classification using machine learning techniques,2002.

Jaganadh G An Introduction to Sentiment Analysis

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Finally

Jaganadh G An Introduction to Sentiment Analysis