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Thread: Explain the link

  1. #1
    Oct 2008

    Explain the link

    Can anyone elaborate more about this:

    $\displaystyle \sum_{i=1}^n Var(Y_i-\hat{Y}_i)+[E(Y_i-\hat{Y}_i)]^2$=

    How is the 2nd term combine into the variance?

    To be more specified: This is the intermediate step in proving $\displaystyle E(MSE)=\sigma$ in regression study. furthermore, $\displaystyle \hat{Y}_i=b_0+b_1X_i$
    Last edited by noob mathematician; Jan 22nd 2010 at 04:21 AM.
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