Dictionary-Methods - Sentiment Analysis
Lab 2: Conceptual Overview
What is Sentiment Analysis?
By summing the values related to each word in a document, we will be able to find out the tone or sentiment of the whole document.
Figure source: Silge & Robinson, 2017
Research Questions
What is the public sentiment expressed toward the NGSS? How does sentiment for NGSS compare to sentiment for CCSS?
Take a look at the dataset located here and consider the following:
- What format is this data set stored as?
- What are some things you notice about this dataset?
- What questions do you have about this dataset?
- What similar dataset do you have?
- What research questions do you want to address with your dataset?
Inner_join
inner_join() allows us to keep only the rows with words that match words in our sentiment lexicons, or dictionaries, along with the sentiment measure for that word from the sentiment lexicon.
Affin, Bing, Loughran, NRC
There is a difference in the intended use of the lexicon. The following figure shows the different lexicons, the number of words in the lexicon, resolution, calculation method and classification method.
Affin, Bing, Loughran, NRC
Thank you!
Dr. Shiyan Jiang
