Sentiment analysis is a technique used to identify opinions expressed in text and classify them as positive, negative, or neutral. It can be performed at the word, sentence, or document level. Examples are provided of sentiment analysis on reviews from blogs, social media, and other websites to classify opinions on products, movies, and other topics.

1. Sentiment Analysis
M.Sri Anusha
CSE IV yr.
Under the guidance of
K.M.M Rajashekaraih,
Assistant Professor.

2. Introduction to Sentiment
Analysis

3. What is Sentiment Analysis
Identifying the opinion in a piece of text
My Phone My phone has My Phone
is awesome! 5MP camera is horrible!
[ Sentimental ] [ Factual ] [ Sentimental ]
It can be generalized over a wider set of
emotions

4. Sentiment Analysis
at different levels

5. Word Level Sentiment Analysis
The movie was
fabulous
Word-level
fabulous Sentiment
Analysis
The movie was
very boring
boring

6. Sentence Level Sentiment Analysis
The poverty
of India is
Sentence-level SA
decreasing
poverty(subj.) India(noun) decreasing(verb)

7. Document Level Sentiment Analysis
I suggest that instead of fillings
songs in tunes you should fill tunes
(not made of songs) only. The
phone has good popularity in old Document-level
Sentiment Analysis
age people. Third i had tried much
for its data cable but i find it
nowhere. It should be supplied
with set with some extra cost.
Good features of this phone are its
cheapest price and durability . It
should have some features more
than nokia 1200. it is easily
available in market and repair is
also available

8. Challenges and Difficulties
Sarcasm/Irony
Sarcasm uses words of
a polarity to represent
another polarity.
Example: The perfume is so
amazing that I suggest you wear it
with your windows shut.

9. Counter Expressions
the sentences/words that
contradict the overall sentiment
of the set are in majority
Example: The storyline of the
movie is good
and the actors are good,
But the movie turned out to
a biggest failure in the history

10. Opinion on the Web

11. Web has emotions!

12. Sentiment Analysis on Web
Sentiment Analysis aims at obtaining
sentiment-related information from documents
on the web.
Where on web?

13. Sentiment can be found here:
Blogs/Facebook/Twitter etc.
User comments
Review websites

14. How blogs are helpful for
Sentiment Analysis?
Blogs are user-controlled.
Blogs represent individual writers and their
reviews on any of the products.

15. Review-related content on blogs
Image from:
http://www.blogger.com/blogger.gblogID=1265412977377655233#ove
rviewstats

16. User Comments
Generally we find user comments on
all the social networking sites which
may be
» Positive
» Negative
» Neutral

17. Some of the Review Websites
www.burrrp.com Reviews on Restaurants
www.mouthshut.com
Reviews on a wide variety of
www.justdial.com subjects.
www.yelp.com
Movie reviews by
www.zagat.com professional critics, users.
Links to external reviews also
www.bollywoodhungama.com present
www.indya.com

18. Example of a Review website

19. Sample Review 1
 FLY E300 is a good mobile which i purchased recently with lots of
‘Touch screen’ today signifies
hesitation. Since this Brand is not familiar in Market as well known
a positive feature.
as Sony Ericsson. But i found that E300 was cheap with almost all
the features for a good mobile. Any other brand with future?
Will it be the same in the the same set
t
of features would come around 19k Indian Ruppees.. But this one
is t
only 9k.
Comparing old products
Touch Screen, good resolution, good talk time, 3.2Mega Pixel
camera, A2DP, IRDA and so on...
BUT BEWARE THAT THE CAMERA IS NOT THAT GOOD,
THOUGH IT FEATURES 3.2 MEGA PIXEL, ITS NOT AS GOOD
AS MY PREVIOUS MOBILE SONY ERICSSION K750i which is
just 2Mega Pixel.
Sony ericsson was excellent with the feature of camera. So if
anyone is thinking for Camera, please excuse. This model of FLY is
not apt for you.. Am fooled in this regard..

20. Sample Review 2
(Noise)
Hi,
I have Haier phone.. It was good when i was buing this
phone.. But I invented A lot of bad features by this phone
those are It’s cost is low but Software is not good and Battery
is very bad..,,Ther are no signals at out side of the city..,,
People can’t understand this type of software..,, There aren’t
features in this phone, Design is better not good..,, Sound also
bad..So I’m not intrest this side.They are giving heare phones
it is good. They are giving more talktime and validity these
are also good.They are giving colour screen at display time it
is also good because other phones aren’t this type of feature.It
is also low wait.
Wait..!!

21. Sample Review 3
(Alternating sentiments)
I suggest that instead of fillings songs in tunes you
should fill tunes (not made of songs) only.
The phone has good popularity in old age people.
Third i had tried much for its data cable but i find it
nowhere. It should be supplied with set with some
extra cost.
Good features of this phone are its cheapest price and
durability .
It is easily available in market and repair is also
available.

22. Sample Review 5
(Sarcasm)
“ I’ve seen movies where there was practically
no plot besides explosion, explosion,
catchphrase, explosion. I’ve even seen a movie
where nothing happens. But White on Rice was
new on me: a collection of really wonderful
and appealing characters doing completely
baffling and uncharacteristic things. “

23. Community websites/Social
Networking Sites.
Expressing the opinion is an important element of social
networking. It can be done in many ways like:
1. Comments (on status messages,events etc.)
2. ‘Become a fan’ on facebook or
'Like' a page on facebook.
Example: Enjoyed the Rock Band performance by Ricky.
Loved It.
Example: Anish Patel became a fan of 'Shreya Ghoshal'
Priyanka Patil liked 'A R Rehman' page.

24. Existing Sentiment Analyzer
Twitter Sentiment App
Useful for knowing the number of positive
and negative tweets for a particular brand
Also helps in knowing number of
comments,likes about the brand on
facebook and google+.

28. Advantages
>>A lower cost than traditional methods of getting customer
insight.
>>A faster way of getting insight from customer data.
>>The ability to act on customer suggestions.
>>Identifies an organisation's Strengths, Weaknesses,
Opportunities & Threats (SWOT Analysis) .
>>As 80% of all data in a business consists of words, the
Sentiment Engine is an essential tool for making sense of it all.
>>More accurate and insightful customer perceptions and
feedback.

29. References
http://sentimentengine.com/benefits-of-sentiment-analysis.html
http://www.emarketingandcommerce.com/story/five-ways-leverage-
microblogging
twittersentiment.appspot.com/
http://ezinearticles.com/?Opinion-Mining-and-Sentiment-
Analysis&id=5833926
http://en.wikipedia.org/wiki/Sentiment_analysis