Errata for 2nd Edition, Fourth Print
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."