[EMAIL PROTECTED] (bw) wrote in news:[EMAIL PROTECTED]:
> I think you can just show that the point (xbar,ybar) is on the line. > > Since y^=b1+b2x, by summing both side from 1 to n, > > Sum(y from 1 to n) = Sum[(b1+b2*(X from 1 to n)] You've magically slid from y-hat (predicted y) to y (observed y) here. > =nb1 + b2*[sum(x from 1 to n)] > Dividing both side by n, you get > ybar = b1 + b2*Xbar. > > This shows that (xbar,ybar) is on the line :) It shows that the mean *predicted* y occurs at xbar, but the OP needs to show that the mean *observed* y occurs there too. . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
