Problem $10-$ Chapter $5$

a$)$ Compute inflation rate for Jan $2018$ using exponential smoothing with contraint $-\mathrm{.}4$ and b$)$ with $\mathrm{.}8$

Assume forecast for Jan $2017$ is $2\mathrm{.}5$

b$)$ What is the MAD for the forecasts generated using exponential smothing method with $\mathrm{.}4$ and $\mathrm{.}8$

use only the months from March to December