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Python Data Analysis

You're reading from   Python Data Analysis Perform data collection, data processing, wrangling, visualization, and model building using Python

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Product type Paperback
Published in Feb 2021
Publisher Packt
ISBN-13 9781789955248
Length 478 pages
Edition 3rd Edition
Languages
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Authors (2):
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 Navlani Navlani
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Navlani
Ivan Idris Ivan Idris
Author Profile Icon Ivan Idris
Ivan Idris
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Table of Contents (20) Chapters Close

Preface 1. Section 1: Foundation for Data Analysis
2. Getting Started with Python Libraries FREE CHAPTER 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

Count plots

countplot() is a special type of bar plot. It shows the frequency of each categorical variable. It is also known as a histogram for categorical variables. It makes operations very simple compared to Matplotlib. In Matplotlib, to create a count plot, first we need to group by the category column and count the frequency of each class. After that, this count is consumed by Matplotlib's bar plot. But the Seaborn count plot offers a single line of code to plot the distribution:

# Create count plot (also known as Histogram)
sns.countplot(x='salary', data=df)

# Show figure
plt.show()

This results in the following output:

In the preceding example, we are counting the salary variable. The count() function takes a single column and DataFrame. So, we can easily conclude from the graph that most of the employees have low and medium salaries. We can also use hue as the second variable. Let's see the following example:

# Create count plot (also known as Histogram...
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