Algorithm to determine how positive or negative a statement/text is

Question

I need to implement sentiment analysis. Can anyone point me to examples/reference implementations?

Duplicate http://stackoverflow.com/questions/293000/algorithm-to-determine-how-positive-or-negative-a-statement-text-is — cletus, Aug 25 '09 at 05:25
Also http://stackoverflow.com/questions/122595/nlp-qualitatively-positive-vs-negative-sentence and http://stackoverflow.com/questions/933212/is-it-possible-to-guess-a-users-mood-based-on-the-structure-of-text — cletus, Aug 25 '09 at 05:26

score 3 · Answer 1 · answered Aug 25 '09 at 05:22

3

answered Aug 25 '09 at 05:22

Alix Axel

score 2 · Answer 2 · answered Aug 25 '09 at 05:24

One approach is:

assemble a corpus of statements and text
manually classify each statement as positive or negative
ensure your corpus is "large enough" in size, e.g. ~1,000 classifications
run the corpus through pattern recognition software such as CRM114: http://en.wikipedia.org/wiki/CRM114_(program)
use the resulting "brain file" to classify future statements

2 Answers2