Book Image

Clojure Data Analysis Cookbook

By : Eric Rochester
Book Image

Clojure Data Analysis Cookbook

By: Eric Rochester

Overview of this book

<p>Data is everywhere and it's increasingly important to be able to gain insights that we can act on. Using Clojure for data analysis and collection, this book will show you how to gain fresh insights and perspectives from your data with an essential collection of practical, structured recipes.<br /><br />"The Clojure Data Analysis Cookbook" presents recipes for every stage of the data analysis process. Whether scraping data off a web page, performing data mining, or creating graphs for the web, this book has something for the task at hand.<br /><br />You'll learn how to acquire data, clean it up, and transform it into useful graphs which can then be analyzed and published to the Internet. Coverage includes advanced topics like processing data concurrently, applying powerful statistical techniques like Bayesian modelling, and even data mining algorithms such as K-means clustering, neural networks, and association rules.</p>
Table of Contents (18 chapters)
Clojure Data Analysis Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Creating histograms with Incanter


Histograms are useful for seeing the distribution of data. It's even effective with continuous data. In a histogram, the data is divided into a limited number of buckets—10 is common—and the number of items in each bucket is counted. Histograms are especially useful for finding how much data are available for various percentiles. For instance, these charts can clearly show how much of your data was in the 90th percentile or lower.

Getting ready

We'll use the same dependencies in our project.clj file as we did in the Creating scatter plots with Incanter recipe.

We'll use the following set of imports in our script or REPL:

(require '[incanter.core :as i]
         '[incanter.charts :as c]
         '[incanter.io :as iio])

For this recipe, we'll use the iris dataset that we used in the Creating scatter plots with Incanter recipe.

(def iris (incanter.datasets/get-dataset :iris))

How to do it…

As we have in the previous recipes, we just create the graph and display it...