Hands-On Automated Machine Learning
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Working of OLS regression

The OLS LinearRegression method is the most straightforward approach to fit a function to the data. It finds the best-fit line by minimizing the sum of squared errors (SSE) of the data. The SSE is the sum of the deviations of actual values from the mean. However, as always, the simplicity comes with a price. The price to pay for an excellent OLS method is adhering to its several fundamental assumptions.