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

Loading CSV and ARFF files into Weka


Weka is most comfortable using its own file format, ARFF. This format includes the types of data in the columns and other information that allows it to be loaded incrementally. However, Weka can still import CSV files, and when it does, it attempts to guess the type of data in the columns.

In this recipe, we'll see what's necessary to load data from a CSV file and an ARFF file.

Getting ready

First, we'll need to add Weka to the dependencies in our Leiningen project.clj file:

:dependencies [[org.clojure/clojure "1.4.0"]
               [nz.ac.waikato.cms.weka/weka-dev "3.7.7"]]

Then, we'll import the right classes into our script or REPL.

(import [weka.core.converters ArffLoader CSVLoader]
        [java.io File])

Finally, we'll need to have a CSV file to import. In this recipe, I'll use the dataset of racial census data that we compiled for the Grouping data with $group-by recipe in Chapter 6, Working with Incanter Datasets. It's in the file named data/all_160...