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Python Data Analysis - Third Edition

You're reading from  Python Data Analysis - Third Edition

Product type Book
Published in Feb 2021
Publisher Packt
ISBN-13 9781789955248
Pages 478 pages
Edition 3rd Edition
Languages
Authors (2):
Avinash Navlani Avinash Navlani
Profile icon Avinash Navlani
Ivan Idris Ivan Idris
Profile icon Ivan Idris
View More author details
Toc

Table of Contents (20) Chapters close

Preface 1. Section 1: Foundation for Data Analysis
2. Getting Started with Python Libraries 3. NumPy and pandas 4. Statistics 5. Linear Algebra 6. Section 2: Exploratory Data Analysis and Data Cleaning
7. Data Visualization 8. Retrieving, Processing, and Storing Data 9. Cleaning Messy Data 10. Signal Processing and Time Series 11. Section 3: Deep Dive into Machine Learning
12. Supervised Learning - Regression Analysis 13. Supervised Learning - Classification Techniques 14. Unsupervised Learning - PCA and Clustering 15. Section 4: NLP, Image Analytics, and Parallel Computing
16. Analyzing Textual Data 17. Analyzing Image Data 18. Parallel Computing Using Dask 19. Other Books You May Enjoy

Skewness and kurtosis

Skewness measures the symmetry of a distribution. It shows how much the distribution deviates from a normal distribution. Its values can be zero, positive, and negative. A zero value represents a perfectly normal shape of a distribution. Positive skewness is shown by the tails pointing toward the right—that is, outliers are skewed to the right and data stacked up on the left. Negative skewness is shown by the tails pointing toward the left—that is, outliers are skewed to the left and data stacked up on the right. Positive skewness occurs when the mean is greater than the median and the mode. Negative skewness occurs when the mean is less than the median and mode. Let's compute skewness in the following code block:

# skewness of communication_skill_score column
data['communcation_skill_score'].skew()

Output:
-1.704679180800373

In the preceding code block, we have computed the skewness of the communication skill score column using the skew...

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