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Sxx in linear regression Ask Question Asked 10 years, 5 months ago Modified 2 years, 7 months ago SXX SXX is one of the components computed in finding the correlation and regression. It is a measure of variability. It is also known as the sum of squares of the variable x. Key Vocabulary: Standard. In a Simple linear regression model, I have only Sxy and Syy data with me. How shall I derive Sxx, linking Sxy and Syy based on first principles? I know the formulas separately. I want to. Prove that both formulas for Sxx in the product moment correlation coefficient are equal. Ask Question Asked 8 years, 5 months ago Modified 7 years, 9 months ago