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!

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- May 30th 2009, 05:36 PMStillRussianLinear 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 PMslider142
Going through the sum, this boils down to showing that $\displaystyle \Sigma (x_i - \bar{x}) = 0$

- May 30th 2009, 07:29 PMStillRussian
Aaaaahhhrrgh

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