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

Subplots

Drawing a subplot can be a very useful data analytics and data preprocessing tool. We use subplots when we want to populate more than one visual and organize them next to one another in a specific way.

The following screenshot shows an example of subplotting. The logic of creating subplots in Matplotlib is unique and interesting. To draw a subplot, you first need to plan and decide the number of visuals you intend to have and their matrix-like organization. For instance, the following example has two visuals, and the visuals are organized in a matrix with two rows and one column. Once you know that, you can start coding.

Let's do this together step by step:

  1. The logic of Matplotlib subplots is that you use a line of code to announce you are about to start giving the code for each specific visual. The plt.subplot(2,1,1) line says that you want to have a subplot with two rows and one column, and you are about to run the code for the first visual.
  2. Once you...