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

Cleaning the data

While going about data integration, we took care of some level I data cleaning as well, such as the data being in one standard data structure and the attributes having codable and intuitive titles. However, because in_df is integrated from five different sources, the chances are that different data recording practices may have been used, which may lead to inconsistency across in_df.

For instance, the following figure shows how varied data collection for the Gender attribute has been:

Figure 15.3 – The state of the Gender attribute before cleaning

We need to go over every attribute and make sure that there is no repetition of the same possibilities in a slightly different wording due to varying data collection or misspellings.

Detecting and dealing with outliers and errors

As our AQs are only going to rely on data visualization for answers, we don't need to detect outliers, as our addressing them would be adopting...