Sxx=∑(xi−x̄)2cap S sub x x end-sub equals sum of open paren x sub i minus x bar close paren squared In this expression: represents each individual data point in the set. is the sample mean (
Thus, Sxx is the most basic building block: the corrected sum of squares for a single variable. Sxx Variance Formula
If you want, I can show a short numeric example or provide code (Python/R) to compute Sxx and variance. Sxx=∑(xi−x̄)2cap S sub x x end-sub equals sum