Physics – Physics and Society
Scientific paper
2005-04-21
Physics
Physics and Society
6 pages Latex, 3 figures; To appear in "Practical Fruits of Econophysics" ed H. Takayasu (Springer Verlag, 2005)
Scientific paper
We review a resent {\em time-dependent} performance measure for economical
time series -- the (optimal) investment horizon approach. For stock indices,
the approach shows a pronounced gain-loss asymmetry that is {\em not} observed
for the individual stocks that comprise the index. This difference may hint
towards an synchronize of the draw downs of the stocks.
Jensen Mogens H.
Johansen Anders
Simonsen Ingve
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