Histograms

Let's move on to the first visualization steps. By now you already know how to clean, prepare, and aggregate data for further analysis. We'll start with histograms.

What is a histogram? Histogram is a graph that represents frequencies of numerical data (usually numerical intervals). To build histogram in pandas, apply the .hist() method to selected data. For instance, let's build a histogram for the 'totinch' column.

Note that you don't need to use the print() function to output the plot.


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# Importing the library
import pandas as pd

# Reading the file
df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/f2947b09-5f0d-4ad9-992f-ec0b87cd4b3f/data4.csv')

# Histogram for the totinch column values
df.totinch.hist()

As parameters, you can set color (color for rectangles, like 'r', 'g', 'b', etc.) or bins (number of intervals to divide data). Let's make rectangles red and set the number of intervals to 50.


              12345678
            
# Importing the library
import pandas as pd

# Reading the file
df = pd.read_csv('https://codefinity-content-media.s3.eu-west-1.amazonaws.com/f2947b09-5f0d-4ad9-992f-ec0b87cd4b3f/data4.csv')

# Histogram for the totinch column values
df.totinch.hist(color = 'r', bins = 50)

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Avsnitt 4. Kapitel 5

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Data Manipulation using pandas

1. Preprocessing Data: Part I

What is Data Preprocessing?Types consistency Poor Data Presentation Manipulating Strings Challenge Replacing Specific Elements Simultaneous Replacement Challenge

2. Preprocessing Data: Part II

Logical Inconsistency Removing Rows Challenge Outliers Challenge Missing Values Filling NA values Challenge

3. Grouping Data

What is Grouping Data?Grouping in pandas [1/2]Challenge Grouping in pandas [2/2]Challenge Grouping by Several Columns Challenge

4. Aggregating and Visualizing Data

Advanced Aggregation [1/2]Challenge Advanced Aggregation [2/2]Challenge Histograms Challenge Bar and Scatter Plots Other Types of Graphs Challenge 1 Challenge 2

5. Joining Data

What is Joining Data?Left Join Right Join Inner Join Outer Join Concatenation