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

Example of Matplotilb assisting data preprocessing

A great way to get to know a new dataset is to visualize its columns. The numerical columns are best visualized using either histograms or boxplots. However, the combination of the two is the best, especially when the boxplot is drawn vertically. Use the subplot function of Matplotlib to draw the histogram and boxplot of all the numerical columns of adult_df in a 2x5 matrix-like visual. Make sure that the histogram and the boxplot of each column are in the same subplot column. Also, save the visual in a file named ColumnsVsiaulization.png with a resolution of 900 DPI.

The following code shows the solution for this example:

Numerical_colums = ['age', 'education_num', 'capitalGain', 'capitalLoss', 'hoursPerWeek']
plt.figure(figsize=(20,5)) 
for i,col in enumerate(Numerical_colums):
    plt.subplot(2,5,i+1)
    plt.hist(adult_df[col])
 ...