Sxx Variance Formula Jun 2026

If you are studying statistics for regression analysis, $S_xx$ is a critical component for finding the "Line of Best Fit" ($y = a + bx$).

s=Sxxn−1s equals the square root of the fraction with numerator cap S sub x x end-sub and denominator n minus 1 end-fraction end-root Role in Linear Regression Beyond simple spread, Sxxcap S sub x x end-sub Sxx Variance Formula

This is often called the (or sum of squares about the mean). It measures the total squared deviation of each data point from the average. If you are studying statistics for regression analysis,

Sxxcap S sub x x end-sub represents the Sum of Squares for variable Sxxcap S sub x x end-sub represents the

The regression slope ( b_1 ) is given by:

Use this for faster math or when working with large datasets:

Understanding Sxx is crucial because it serves as the building block for calculating variance, standard deviation, and the slope of a regression line. What is Sxx?