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Python Data Cleaning Cookbook

Python Data Cleaning Cookbook - Second Edition

By : Michael Walker
4.9 (22)
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Python Data Cleaning Cookbook

Python Data Cleaning Cookbook

4.9 (22)
By: Michael Walker

Overview of this book

Jumping into data analysis without proper data cleaning will certainly lead to incorrect results. The Python Data Cleaning Cookbook - Second Edition will show you tools and techniques for cleaning and handling data with Python for better outcomes. Fully updated to the latest version of Python and all relevant tools, this book will teach you how to manipulate and clean data to get it into a useful form. he current edition focuses on advanced techniques like machine learning and AI-specific approaches and tools for data cleaning along with the conventional ones. The book also delves into tips and techniques to process and clean data for ML, AI, and NLP models. You will learn how to filter and summarize data to gain insights and better understand what makes sense and what does not, along with discovering how to operate on data to address the issues you've identified. Next, you’ll cover recipes for using supervised learning and Naive Bayes analysis to identify unexpected values and classification errors and generate visualizations for exploratory data analysis (EDA) to identify unexpected values. Finally, you’ll build functions and classes that you can reuse without modification when you have new data. By the end of this Data Cleaning book, you'll know how to clean data and diagnose problems within it.
Table of Contents (14 chapters)
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13
Index

Addressing Data Issues When Combining DataFrames

At some point during most data cleaning projects, the analyst will have to combine data from different data tables. This involves either appending data with the same structure to existing data rows or doing a merge to retrieve columns from a different data table. The former is sometimes referred to as combining data vertically, or concatenating, while the latter is referred to as combining data horizontally, or merging.

Merges can be categorized by the amount of duplication of merge-by column values. With one-to-one merges, merge-by column values appear once on each data table. One-to-many merges have unduplicated merge-by column values on one side of the merge and duplicated merge-by column values on the other side. Many-to-many merges have duplicated merge-by column values on both sides. Merging is further complicated by the fact that there is often no perfect correspondence between merge-by values on the data tables; each data...

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Python Data Cleaning Cookbook
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