What they think about my brand/product ?!?!? An Introduction to Sentiment Analysis

What they think about my

brand/product ?!?!?An Introduction to Sentiment Analysis

Jaganadh GProject Lead NLP R&D

365Media Pvt. [email protected]

National Seminaron

Semantic Information RetrievalNational Institute of Technology

Tiruchirapally

30th Jan 2012

Jaganadh G What they think about my brand/product ?!?!?

About me !!

Software Engineer Specializing in Text Analytics Research& Development

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

Working as Project Lead (NLP) 365Media Pvt. Ltd.Coimbatore

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

Maters Degree Holder in Sanskrit from University ofKerala


Introduction

Web Today


Introduction

Sentiment

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


Introduction

What other people think!!!


Introduction

Friends and Family

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


Introduction

Survey

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


Introduction

Blogs, Forums, Social Network ....

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

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


Introduction

Issues with blogs and forums

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


Introduction

Now : Sentiment Analysis


What is Sentiment Analysis

Sentiment Analysis

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


Subjectivity

Subjectivity

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

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


Subjective Text Sources

Social Media

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


Example Review

Nokia Lumia 800

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


The Big Picture

Sentiment Analysis


Basics of Sentiment Analysis

Components of Opinion


Basics of Sentiment Analysis

Opinion Definition


Components of Sentiment Analysis

Components


Approaches

Approaches

Lexicon based

Supervised Learning

Unsupervised Learning

Keyword


Issues and Challenges

Challenges

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


Issues and Challenges

Challenges

Language

Domain

Spam

Named Entity Identification

Reliable content


Questions ??


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.


Finally
