Analyse Sentiment of English Sentences.
RSentiment
A package in R to analyse sentiment of English sentences
This package contains three functions that allow R users to analyse sentiment (Positive, Negative, Very Positive, Very Negative, Neutral, Sarcasm) of a text. This package is currently supported in English only.
Current CRAN release is 2.1.3. To install the most updated version of this package from CRAN, run the following code.
install.packages("RSentiment")
calculate_score()
This function loads text and calculates score of each sentence of the text fed on basis of following conditions.
- Parts of Speech tagging of each word of the sentence
- Identifying various conditions of occurrences and presence of Verb, Adverb, Adjective, Noun etc in each sentence
- Accordingly, marking the presence of words of positive and negative sentiment and order of their occurence
- Considering negation
- Checking for sarcasm on basis of presence of punctuation(currently)
- Checking presence of emoticons in the text
This method can provide result in the following range.
- 0 indicates neutral sentiment.
- Positive value indicates positive sentiment.
- Negative value indicates negative sentiment.
- 99 indicates sarcasm.
calculate_sentiment()
This function loads text and calculates sentiment of each sentence. This function uses the score predicted by calculate_score method to classify the sentences. It classifies sentences into 6 categories:
- Positive
- Negative
- Very Positive
- Very Negative
- Sarcasm
- Neutral
calculate_total_presence_sentiment()
This function loads text and calculates number of sentences under each category of
- Positive
- Negative
- Very Positive
- Very Negative
- Neutral
- Sarcasm.