*
* Example page 71
*
cal(d) 1990:1:2
all 2003:12:31
*
open data ch02_sp500_d(90-03).txt
data(format=free,org=columns) 1 3532 year index
*
log index / lnindex
*
graph(footer="Figure 2.12 Time plot of logarithm of daily S&P 500 Index")
# lnindex
*
@dfunit(lags=13,trend) lnindex