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Once more unto the breach, dear friends! Visualizing narrative arcs. Now you will build on the code from the previous exercise and continue to move forward to see how sentiment changes through these Shakespearean plays.

Notice how the comedies have happier endings and more positive sentiment overall than the tragedies. You have already learned a lot in the first two case studies of this tutorial, from how to transform text to a tidy format and how to use sentiment lexicons. In this third case study, we will learn some new ways to analyze text, using a data set of newspaper headlines.

The data set we'll be working with has two variables:. Headlines are interesting for many reasons. Text data is often fraught and complex, and that is certainly true for newspaper headlines! The next most used categories in this data set are headlines about world news and the opinion page. Tidying newspaper headlines.

This data set contains over newspaper headlines, from November The headlines are all in one column, so they are not yet in a tidy format, ready for our tidy set of tools. It's time for you to tidy these headlines! Notice that you use whatever column name the text happens to be in. Most common headline words. What are the most common words in these headlines?

Analyzing headlines is not quite like analyzing other kinds of text, but to be honest, that turns out to be true a lot of the time. This is pretty wild. The overall top words tell us a lot about this corpus of headlines, but let's remove the default list of stop words to get a better idea of what was being reported at the NYT in November What are the newspaper sections about? A central question in text mining is how to quantify what different documents or categories of documents are about.

If you multiply the two together, you get tf-idf, a statistic intended to measure how important a word is to a document in a collection or corpus of documents. Let's look at this in the context of the NYT headlines. In our case study here, each headline is a document, and the corpus is the whole month of headlines.

Not all the headlines in this data set are what we would think of as traditional headlines. Visualize tf-idf. Let's use visualization to understand the high tf-idf words better. Also notice that we filtered out those headlines with one word. Tokenize headlines to bigrams. We've focused on single word unigrams in this case study so far, but you can compute tf-idf for lots of different kinds of things, including higher order n-grams, like bigrams. Compute tf-idf of bigrams.

Computing tf-idf for bigrams works almost just the same as computing tf-idf for words! I've never really paid much attention to headlines there but we are learning here that they are used differently. Highest tf-idf bigrams. There are whole lines missing from this pipeline, but check out the previous exercise where you created a visualization to refresh your memory about what steps to take! The reason that high tf-idf bigrams about drilling are associated with climate reporting is because tf-idf is good at finding distinctive tokens in a document compared to a collection of other documents.

You have made it to your final case study of this tutorial! This case study demonstrates again how these kinds of techniques are applicable for many diverse kinds of texts. Create a new account. Log In. Powered by CITE. Missing lyrics by Ice Cube? Know any other songs by Ice Cube? Don't keep it to yourself!

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