# Linear Regression (Sxy) proof help needed

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• May 30th 2009, 05:36 PM
StillRussian
Linear Regression (Sxy) proof help needed
Hello everyone!

I am looking for help with proving the following:

Sum(xi - x_bar)(yi - y_bar) = Sum(xi- x_bar)yi

Thanks in advance!
• May 30th 2009, 06:16 PM
slider142
Going through the sum, this boils down to showing that $\Sigma (x_i - \bar{x}) = 0$
• May 30th 2009, 07:29 PM
StillRussian
Aaaaahhhrrgh

Thank you so much! I cannot believe I did not see this! Thank you again!