Book Image

Hands-On Data Preprocessing in Python

By : Roy Jafari
5 (2)
Book Image

Hands-On Data Preprocessing in Python

5 (2)
By: Roy Jafari

Overview of this book

Hands-On Data Preprocessing is a primer on the best data cleaning and preprocessing techniques, written by an expert who’s developed college-level courses on data preprocessing and related subjects. With this book, you’ll be equipped with the optimum data preprocessing techniques from multiple perspectives, ensuring that you get the best possible insights from your data. You'll learn about different technical and analytical aspects of data preprocessing – data collection, data cleaning, data integration, data reduction, and data transformation – and get to grips with implementing them using the open source Python programming environment. The hands-on examples and easy-to-follow chapters will help you gain a comprehensive articulation of data preprocessing, its whys and hows, and identify opportunities where data analytics could lead to more effective decision making. As you progress through the chapters, you’ll also understand the role of data management systems and technologies for effective analytics and how to use APIs to pull data. By the end of this Python data preprocessing book, you'll be able to use Python to read, manipulate, and analyze data; perform data cleaning, integration, reduction, and transformation techniques, and handle outliers or missing values to effectively prepare data for analytic tools.
Table of Contents (24 chapters)
1
Part 1:Technical Needs
6
Part 2: Analytic Goals
11
Part 3: The Preprocessing
18
Part 4: Case Studies

Investigating the relationship between two attributes

The best way to investigate the relationships between attributes visually is to do it in pairs. The tools we use for investigating the relationship between a pair of attributes depends on the type of attributes. In what follows, we will cover these tools based on the following pairs: numerical-numerical, categorical-categorical, and categorical-numerical.

Visualizing the relationship between two numerical attributes

The best tool for portraying the relationship between two numerical attributes is the scatter plot. In the following example, we will use a tool called scatter matrix that creates a matrix of scatterplots for a dataset with numerical attributes.

Example of using scatterplots to investigate relationships between numerical attributes

In this example, we will use a new dataset, Universities_imputed_reduced.csv. This dataset's definition of data objects is Universities in the USA, and these data objects...