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I looked around but I was not able to find anything quite like this, so I've gone ahead and built it for myself and thought I should share it. I built a simple macro that takes in a set of actual values and forecasted values, and returns a root mean square error (RMSE) and a mean absolute error (MAE) value. RMSE and MAE are often used to measure the effectiveness of regression analysis, forecasting, time series, etc.
Please let me know what you think and anything fun that you use it for!