1 Introduction

cl-sentiment

cl-sentiment is a Common Lisp library that uses the AFINN-111 word list to perform sentiment analysis on arbitrary text.

Inspired by https://github.com/thisandagain/sentiment, it's particularly suited to looking at Twitter tweets.

The AFINN word list is by Finn Arup Nielsen available from http://www2.imm.dtu.dk/pubdb/views/publication_details.php?id=6010

You might also like to read his paper:

"A new ANEW: Evaluation of a word list for sentiment analysis in microblogs", Proceedings of the ESWC2011 Workshop on 'Making Sense of Microposts': Big things come in small packages 718 in CEUR Workshop Proceedings : 93-98. 2011 May. http://arxiv.org/abs/1103.2903

The AFINN files are copyright protected and distributed under the terms of the Open Database License (ODbL) v1.0, http://www.opendatacommons.org/licenses/odbl/1.0/

cl-sentiment is now available via Quicklisp.

Use initialize to initialize cl-sentiment with the default sentiment word scores.

Call sentiment with some arbitrary text and it returns two values - the sentiment score and the comparative sentiment score. Positive values convey positive sentiment; negative values convey negative sentiment.

Example

CL-USER> (ql:quickload "cl-sentiment")
...
CL-USER> (cl-sentiment:initialize)
#<HASH-TABLE :TEST EQUAL :COUNT 2477 {1003A54463}>
CL-USER> (cl-sentiment:sentiment "Cats are totally amazing!")
4
1
CL-USER> 

Rob Blackwell

December 2012

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2 Systems

The main system appears first, followed by any subsystem dependency.

• cl-sentiment

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3 Files

Files are sorted by type and then listed depth-first from the systems components trees.

• Lisp

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4 Packages

Packages are listed by definition order.

• cl-sentiment

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5 Definitions

Definitions are sorted by export status, category, package, and then by lexicographic order.

• Public Interface
• Internals

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