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PredInt.xls

PredInt.xls

Regression analysis can be used to make forecasts. Prediction intervals put confidence intervals around a forecast. Microsoft Excel's statistical tool pack does not do this. I wrote a macro in Visual Basic to do multiple regression with interactive prediction intervals, meaning that the intervals are automatically recalculated whenever you change the value of a predictor (independent) variable, or the confidence level. The macro also produces scatter plots and a normal probability plot. (Excel's normal probability plot is incorrect.)
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