*
* Graph from page 804
*
all 500
set u = %ran(1.0)
*
* There's clearly something wrong with the scale in figure 21.5, since the two
* series should be around 250 by the end of the sample.
*
set(first=0.0) stochastic = .5+stochastic{1}+u
set(first=0.0) deterministic = .5*t+u
graph 2
# stochastic
# deterministic