How to compute the seasonality in python?-CodePudding

I have to computer the seasonality, but my graph gives me the wrong result. The seasonality in this dataset is quarterly (frequency of 4 months) and with an amplitude of 1.2. I would appreciate and be extremely thankful for any help!

How it should look like:

My graph:

import numpy as np

x_axis = np.arange(0, 200)
seasonality = np.zeros(len(x_axis))

for i, _ in enumerate(x_axis):
    seasonality[i] = 1.2 * np.sin(2 * np.pi * x_axis[i] / 4)

plt.figure(figsize=(14,5))
plt.plot(x_axis[0:13], seasonality[0:13])

This code was used by the professor so it is correct. But the example he used was different. Maybe it is the period that is incorrect.

CodePudding user response：

You don't have enough Xs to have a smooth curve. Use