Refer to Exercise 14.29. Suppose you want to use only the 2013-2014 S&P values to forecast the quarterly 2015 values. Calculate the forecasts using Holt's model with w = .3 and v = .5. Repeat with w = .7 and v = .5.

Use exponential smoothing with w = .7 to smooth the series from 2008 through 2014. Then forecast the quarterly values in 2015 using only the information through the fourth quarter of 2014.