Sxx Variance Formula Jun 2026

In regression and multivariate statistics, the notation ( S_xx ) comes from the idea of .

import numpy as np x = np.array([2,4,6,8]) Sxx = np.sum((x - np.mean(x))**2) print(Sxx) # 20.0 Sxx Variance Formula

Sxx = Σ(xi - x̄)²

This notation system (often attributed to the “corrected sums of squares” approach) is standard in regression textbooks. The “S” stands for “Sum” (or sometimes “Corrected Sum”), and the subscript indicates which variables are involved. In regression and multivariate statistics, the notation (