Agile Data Science - Data Visualization


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Data visualization plays a very important role in data science. We can consider data visualization as a module of data science. Data Science includes more than building predictive models. It includes explanation of models and using them to understand data and make decisions. Data visualization is an integral part of presenting data in the most convincing way.

From the data science point of view, data visualization is a highlighting feature which shows the changes and trends.

Consider the following guidelines for effective data visualization −

  • Position data along common scale.

  • Use of bars are more effective in comparison of circles and squares.

  • Proper color should be used for scatter plots.

  • Use pie chart to show proportions.

  • Sunburst visualization is more effective for hierarchical plots.

Agile needs a simple scripting language for data visualization and with data science in collaboration “Python” is the suggested language for data visualization.

Example 1

The following example demonstrates data visualization of GDP calculated in specific years. “Matplotlib” is the best library for data visualization in Python. The installation of this library is shown below −

Demonstrates Data Visualization

Consider the following code to understand this −

import matplotlib.pyplot as plt
years = [1950, 1960, 1970, 1980, 1990, 2000, 2010]
gdp = [300.2, 543.3, 1075.9, 2862.5, 5979.6, 10289.7, 14958.3]

# create a line chart, years on x-axis, gdp on y-axis
plt.plot(years, gdp, color='green', marker='o', linestyle='solid')

# add a title plt.title("Nominal GDP")
# add a label to the y-axis
plt.ylabel("Billions of $")
plt.show()

Output

The above code generates the following output −

Code Generates

There are many ways to customize the charts with axis labels, line styles and point markers. Let’s focus on the next example which demonstrates the better data visualization. These results can be used for better output.

Example 2

import datetime
import random
import matplotlib.pyplot as plt

# make up some data
x = [datetime.datetime.now() + datetime.timedelta(hours=i) for i in range(12)]
y = [i+random.gauss(0,1) for i,_ in enumerate(x)]

# plot
plt.plot(x,y)

# beautify the x-labels
plt.gcf().autofmt_xdate()
plt.show()

Output

The above code generates the following output −

Code Generates Second

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