Book Image

Practical Data Analysis

By : Hector Cuesta
Book Image

Practical Data Analysis

By: Hector Cuesta

Overview of this book

Plenty of small businesses face big amounts of data but lack the internal skills to support quantitative analysis. Understanding how to harness the power of data analysis using the latest open source technology can lead them to providing better customer service, the visualization of customer needs, or even the ability to obtain fresh insights about the performance of previous products. Practical Data Analysis is a book ideal for home and small business users who want to slice and dice the data they have on hand with minimum hassle.Practical Data Analysis is a hands-on guide to understanding the nature of your data and turn it into insight. It will introduce you to the use of machine learning techniques, social networks analytics, and econometrics to help your clients get insights about the pool of data they have at hand. Performing data preparation and processing over several kinds of data such as text, images, graphs, documents, and time series will also be covered.Practical Data Analysis presents a detailed exploration of the current work in data analysis through self-contained projects. First you will explore the basics of data preparation and transformation through OpenRefine. Then you will get started with exploratory data analysis using the D3js visualization framework. You will also be introduced to some of the machine learning techniques such as, classification, regression, and clusterization through practical projects such as spam classification, predicting gold prices, and finding clusters in your Facebook friends' network. You will learn how to solve problems in text classification, simulation, time series forecast, social media, and MapReduce through detailed projects. Finally you will work with large amounts of Twitter data using MapReduce to perform a sentiment analysis implemented in Python and MongoDB. Practical Data Analysis contains a combination of carefully selected algorithms and data scrubbing that enables you to turn your data into insight.
Table of Contents (24 chapters)
Practical Data Analysis
About the Author
About the Reviewers

Processing the image dataset

The image set used in this chapter is the Caltech-256, obtained from the Computational Vision Lab at CALTECH. We can download the collection of all 30607 images and 256 categories from

In order to implement the DTW, first we need to extract a time series (pixel sequences) from each image. The time series will have a length of 768 values adding the 256 values of each color in the RGB (Red, Green, and Blue) color model of each image. The following code implements the"Image.jpg") function and cast into an array, then simply add the three vectors of color in the list:

from PIL import Image
img ="Image.jpg")
arr = array(img)
list = []
for n in arr: list.append(n[0][0]) #R
for n in arr: list.append(n[0][1]) #G
for n in arr: list.append(n[0][2]) #B


Pillow is a PIL fork by Alex Clark, compatible with Python 2.x and 3.x. PIL is the Python Imaging Library by Fredrik Lundh. In this chapter...