The simplest form of regression in Python is, well, simple linear regression. With simple linear regression, you're trying to ...

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To calculate the sum of squares, subtract the mean from the data points, square the differences, and add them together. There are three types of sum of squares: total, residual, and regression.

The residual sum of squares (RSS) is a statistical technique used to measure the variance in a data set that is not explained by the regression model.