Exponential Smoothing Quick review and Two Ways to find optimal MAD, MSE, MAPE.

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I quickly review Exponential Smoothing and find optimal alpha in two ways and for three measures. I use SOLVER and Data Table to find optimal alpha to minimize MAD, MSE, and MAPE. I show a simple way to find alpha using Data Table to many decimal points.
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I'm little confused on why you would use an alpha of "0.4" as opposed to something else?

mistahj