Useful Functions for Researching and Visualizing Dataset

To get information on our dataset, we can also use the function .describe(). This method shows the summary statistics of your dataset: mean, median, standard deviation, and so on. For example, we are adding this line to the previous code to show all these characteristics of wines:

print(data.describe())


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print(data.describe())

If it is inconvenient for us to work with many digits, we can use method .round(n), where n is the number of decimal places to which you are rounding.

Numbers are great, but it's still not entirely clear what they represent. For this reason, we will use visualization to see what’s going on in our dataset. It is good to see the dataset's representation before building the regression line. The well-known library matplotlib.pyplot is irreplaceable in this situation. To see all our data as a histogram, just use method .hist(). To get a particular chart we are interested in, we can define it in parentheses. Moreover, we can set the bins by using the bins = argument.

For example, here we will see the histogram of color intensity having 20 bins:

# Import the libraries

import matplotlib.pyplot as plt

import pandas as pd

from sklearn.datasets import load_wine

# Load dataset

wine = load_wine()

# Configure pandas to show all features

pd.set_option('display.max_rows', None, 'display.max_columns', None)

# Convert data to a dataframe to view properly

data = pd.DataFrame(data = wine['data'], columns = wine['feature_names'])

# Get all information about our dataset

print(data.describe())

# Visualize the data

data.hist(column = 'color_intensity',bins = 20)

plt.show()


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# Import the libraries
import matplotlib.pyplot as plt 
import pandas as pd 
from sklearn.datasets import load_wine 

# Load dataset 
wine = load_wine() 

# Configure pandas to show all features 
pd.set_option('display.max_rows', None, 'display.max_columns', None) 

# Convert data to a dataframe to view  properly 
data = pd.DataFrame(data = wine['data'], columns = wine['feature_names'])

# Get all information about our dataset 
print(data.describe()) 

# Visualize the data 
data.hist(column = 'color_intensity',bins = 20) 
plt.show()

Output:

Uppgift

Swipe to start coding

Let’s see what's going on inside our set.

[Line #7] Load wine set.
[Line #16] Get and print all information about it using the function .describe().
[Line #19] Visualize data about alcohol consistency in the set, setting column = 'alcohol' and defining bins = 15.

Lösning

# Import the libraries

import matplotlib.pyplot as plt

import pandas as pd

from sklearn.datasets import load_wine

# Load dataset

wine = load_wine()

# Configure pandas to show all features

pd.set_option('display.max_rows', None, 'display.max_columns', None)

# Convert data to a dataframe to view properly

data = pd.DataFrame(data = wine['data'], columns = wine['feature_names'])

# Get all information about the dataset

print(data.describe())

# Visualize the data

data.hist(column = 'alcohol', bins = 15)

plt.show()

Var allt tydligt?

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Avsnitt 1. Kapitel 5

# Import the libraries

import matplotlib.pyplot as plt

import pandas as pd

from sklearn.datasets import load_wine

# Load dataset

wine = ___

# Configure pandas to show all features

pd.set_option('display.max_rows', None, 'display.max_columns', None)

# Convert data to a dataframe to view properly

data = pd.DataFrame(data = wine['data'], columns = wine['feature_names'])

# Get all information about the dataset

print(___)

# Visualize the data

___(column = ___, bins = ___)

plt.show()

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