Computer scienceData scienceMachine learningRegression

Simple linear regression

Finding coefficient a

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Imagine you have an online shop and you have launched various promotions several times to attract customers.

To calculate the number of attracted users $y$ depending on the cost of the advertising campaign $x$ in the future, you want to build a linear regression model:

$y=ax+b$

Find the value of the coefficient $a$ of the target dependency using the least squares method and the data below.

Cost of an advertising campaign	Number of new customers
4	2
6	2
8	3
10	5
12	5

Input values as NumPy arrays

import numpy as np

x = np.array([4, 6, 8, 10, 12])
y = np.array([2, 2, 3, 5, 5])

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