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Hi! I've also posted this message to the SAS EG section but I thought that it could be also posted in this section. I'm new at this, so this may be something really easy that I haven't thought of. I use the EG Linear regression function to forecast a variable which is actually the Difference of the natural logarithm of Y (let's call this Diff_Ln_Y). So the output of the regression looks something like this. Time           Forecast  (Diff_Ln_Y)    Q1 16          0.056 Q2 16          0.057 ...                 ... ...                 ... ...                 ... Q3 18         0.0598 Q4 18         0.0605 Given that i have the actual (Historic) Y value (and consequently Ln_Y) in Q4 15, what i really need is to find a way that I can automatically obtain forecasted Y as my final output as per the following logic: Time           Forecast  (Diff_Ln_Y)         Ln_Y                                                 Y   Q4 15                                                       1.56 Q1 16          0.056                                    1.616 ( 0.056 + 1.56)                       exp(1.616) Q2 16          0.057                                    1.673 ( 0.057 + 1.616)                     exp(1.673) ...                 ... ...                 ... ...                 ... Q3 18         0.0598 Q4 18         0.0605 Then same reasoning needs to be repeated up to Q4 18. Thanks!! ... View more