Sentiment Analysis

abhirajanchan14abhirajanchan14 Member Posts: 1
edited June 14 in Help

hello,

For my MSc Thesis I am delving deeper in predition analysis. I know that Rapidminer has an accelerator for Sentiment Analysis, but I am wondering how they create the scores that are given as a result. If I understand well, a SVM is used on the dataset that you enter. However, the result of a SVM was to create a hyperplane that seperates points +1 from -1 right? So how are the continuous variables in the accelerator created then, and are they actually valid?

 

Answers

  • yyhuangyyhuang Employee, RapidMiner Certified Analyst, RapidMiner Certified Expert, Member Posts: 224  RM Data Scientist

    Hi @abhirajanchan14,

    We have a template for predicting sentiments with labeled data and predictive models (basically any supervised machine learning model can be used, but linear SVM usualy outperform for term-doc table). The resulting confidence for the predicted sentiment will range from 0 to 1.

    sent_temp.png

    Another option is dictionary-based sentiments.

    To calculate sentiment of a document we calculate sentiment of each word. Document sentiment is then calculated as the weighted average value of all word sentiments, which would generate a sentiment score range from -1 to +1.

    extract senti.PNG

    dic senti.PNG

    Also check out the third party extensions: MonkeyLearn, Aylien, Rosette

     

Sign In or Register to comment.