How to visualize 95% confidence interval in Matplotlib?

To visualize 95% confidence interval in Matplotlib, we can take the following steps −

  • Set the figure size and adjust the padding between and around the subplots.

  • Create x and y data sets.

  • Get the confidence interval dataset.

  • Plot the x and y data points using plot() method.

  • Fill the area within the confidence interval range.

  • To display the figure, use show() method.


from matplotlib import pyplot as plt
import numpy as np

plt.rcParams["figure.figsize"] = [7.50, 3.50]
plt.rcParams["figure.autolayout"] = True

x = np.arange(0, 10, 0.05)
y = np.sin(x)

# Define the confidence interval
ci = 0.1 * np.std(y) / np.mean(y)

plt.plot(x, y, color='black', lw=7)

plt.fill_between(x, (y-ci), (y+ci), color='blue', alpha=0.5)