Sxx Variance Formula [updated] May 2026

Thus:

[ \widehat\mathrmVar(S_xx) = \frac2 S_xx^2n-1 ] sxx variance formula

Here’s a concise paper-style explanation, including the formula, its derivation, and its role in variance estimation. 1. Definition of SXX In the context of simple linear regression: including the formula

[ \mathrmVar\left( \fracS_xx\sigma_x^2 \right) = 2(n-1) ] sxx variance formula

[ S_xx = \sum_i=1^n (x_i - \barx)^2 ]

[ \mathrmVar(\hat\beta 1) = \frac\sigma^2S xx ]

Under the :