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OLSR -- Out of sample standard error of residuals

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OLSR -- Out of sample standard error of residuals

I am interested in computing the standard error of residuals during an out-of-sample forecast period. I know how to get the standard error of the residual (STDR) and the standard error of the prediction (STDI) for in-sample data points using STDR and STDI in the output statement in Proc Reg. However, I also have an out-of-sample forecast period for which I know the actual values of the dependent variable, and I calculate the residuals as the difference between the predicted variables based on the regression and the actual variables -- but I do not know how to (easily) get the standard error for these residuals.

Any help would be greatly appreciated.
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