O'Reilly logo

Mastering Clojure Data Analysis by Eric Rochester

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Examining the results

First, let's examine the precision of the classifiers. Remember that the precision is how well the classifiers do at only returning positive reviews. This indicates the percentage of reviews that each classifier has identified as being positive is actually positive in the test set:

Examining the results

We need to remember a couple of things while looking at this graph. First, sentiment analysis is difficult, compared to other categorization tasks. Most importantly, human raters only agree about 80 percent of the time. So, the bar seen in the preceding figure that almost reaches 65 percent is actually decent, if not great. Still, we can see that ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required