Robert S. Thau (rst@ai.mit.edu)
Mon, 17 May 1999 06:51:07 -0400 (EDT)

Terence Sin writes:
> Here is the 1920s stock prices superimposed on top of the 1990s. You
> decide when to start shorting.
> http://www.panix.com/~dhenwood/Stox90svs20s.html

Not on the basis of these curves --- they both look to my eye like
exponentials plus a constant plus noise, which means that the only
thing that you learn from lining up scaled versions is that
exponentials are self-similar. (Any scaling factors will work, so
long as the curves are shifted vertically so they line up at t=0).