| Chapter 3, Section on Zero Counts (last sentence), p.54|| "...positive errors (under-forecasts) than negative errors (over-forecasts)"|
| Chapter 6, Figure 6.5 (Moving Average Smoothing)
|| MAPE should be 212.09
| Chapter 6, Figure 6.7 (Exponential Smoothing) and page 127 (Section 6.4; "Choosing Smoothing Constant alpha") last paragraph.|| Corrected Figure (uses residuals until Mar-03 to generate forecast of Apr-03 residual) - click to enlarge. |
Accordingly, the text should read: "We see that the forecast for the residual is -58,220 riders, implying that we should adjust the regression's forecast by reducing 58,220 riders from that forecast."