Java: Data Science Made Easy

Joinery

You might notice that the code we just wrote is quite verbose. Of course, it is possible to put it inside a helper function and call it when needed, but there is another more concise way of computing these statistics--with joinery and its DataFrames. 

In Joinery, the DataFrame object has a method called describe, which creates a new DataFrame with summary statistics:

List<RankedPage> pages = Data.readRankedPages(); DataFrame<Object> df = BeanToJoinery.convert(pages, RankedPage.class); df = df.retain("bodyContentLength", "titleLength", "numberOfHeaders"); DataFrame<Object> describe = df.describe(); System.out.println(describe.toString());

In the preceding code, Data.readRankedPages is a helper method that reads JSON data and converts ...