*
* Example from pp 281-284
*
open data stocka.dat
data(format=free,org=columns) 1 100 time stock
*
graph(footer="Figure 7-2 Daily Stock Prices")
# stock
@bjident stock
*
diff stock / dstock
*
graph(footer="Figure 7-3 First Differences")
# dstock
*
@bjident dstock
*
boxjenk(ar=0,ma=0,const) dstock
@regcorrs