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Big Data Analysis with Python

You're reading from Big Data Analysis with Python Combine Spark and Python to unlock the powers of parallel computing and machine learning

Product type Paperback

Published in Apr 2019

Publisher Packt

ISBN-13 9781789955286

Length 276 pages

Edition 1st Edition

Languages

Python

Tools

Combine

Concepts

Big Data

Authors (3):

Ivan Marin

Sarang VK

Ankit Shukla

View More author details

Table of Contents (11) Chapters

Big Data Analysis with Python

Preface

1. The Python Data Science Stack FREE CHAPTER

2. Statistical Visualizations

3. Working with Big Data Frameworks

4. Diving Deeper with Spark

5. Handling Missing Values and Correlation Analysis

6. Exploratory Data Analysis

7. Reproducibility in Big Data Analysis

8. Creating a Full Analysis Report

Appendix

Missing Values

The data entries with no value assigned to them are called missing values. In the real world, encountering missing values in data is common. Values may be missing for a wide variety of reasons, such as non-responsiveness of the system/responder, data corruption, and partial deletion.

Some fields are more likely than other fields to contain missing values. For example, income data collected from surveys is likely to contain missing values, because of people not wanting to disclose their income.

Nevertheless, it is one of the major problems plaguing the data analytics world. Depending on the percentage of missing data, missing values may prove to be a significant challenge in data preparation and exploratory analysis. So, it's important to calculate the missing data percentage before getting started with data analysis.

In the following exercise, we will learn how to detect and calculate the number of missing value entries in PySpark DataFrames.

Exercise 38: Counting Missing Values...

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Authors (3)

Marin

Marin

Ivan Marin is a systems architect and data scientist working at Daitan Group, a Campinas-based software company. He designs big data systems for large volumes of data and implements machine learning pipelines end to end using Python and Spark. He is also an active organizer of data science, machine learning, and Python in So Paulo, and has given Python for data science courses at university level.

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VK

VK

Sarang VK is a lead data scientist at StraitsBridge Advisors, where his responsibilities include requirement gathering, solutioning, development, and productization of scalable machine learning, artificial intelligence, and analytical solutions using open source technologies. Alongside this, he supports pre-sales and competency.

See other products by VK

Shukla

Shukla

Vishal Shukla is the CEO of Brevitaz Systems (http://brevitaz.com) and a technology evangelist at heart. He is a passionate software scientist and a big data expert. Vishal has extensive experience in designing modular enterprise systems. Since his college days (more than 11 years), Vishal has enjoyed coding in JVM-based languages. He also embraces design thinking and sustainable software development. He has vast experience in architecting enterprise systems in various domains. Vishal is deeply interested in technologies related to big data engineering, analytics, and machine learning. He set up Brevitaz Systems. This company delivers massively scalable and sustainable big data and analytics-based enterprise applications to their global clientele. With varied expertise in big data technologies and architectural acumen, the Brevitaz team successfully developed and re-engineered a number of legacy systems to state-of-the-art scalable systems. Brevitaz has imbibed in its culture agile practices, such as scrum, test-driven development, continuous integration, and continuous delivery, to deliver high-quality products to its clients. Vishal is a music and art lover. He loves to sing, play musical instruments, draw portraits, and play sports, such as cricket, table tennis, and pool, in his free time. You can contact Vishal at [email protected] and on LinkedIn at https://in.linkedin.com/in/vishalshu. You can also follow Vishal on Twitter at @vishal1shukla2.

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