The Actual and Forecast Values of a Time Series Are

question 130

Essay

The actual and forecast values of a time series are shown below. $$\begin{array} { | c c | } \hline \text { Actual values } y _ { t } & \text { Forecast values } F _ { t } \\\hline 135 & 140 \\162 & 165 \\155 & 150 \\182 & 191 \\174 & 168 \\194 & 190 \\233 & 220 \\280 & 240 \\\hline\end{array}$$ a. Calculate the mean absolute deviation (MAD).
b. Calculate the sum of squares for forecast error (SSE).