2,489 research outputs found
Fractality of profit landscapes and validation of time series models for stock prices
We apply a simple trading strategy for various time series of real and
artificial stock prices to understand the origin of fractality observed in the
resulting profit landscapes. The strategy contains only two parameters and
, and the sell (buy) decision is made when the log return is larger
(smaller) than (). We discretize the unit square into the square grid and the profit is
calculated at the center of each cell. We confirm the previous finding that
local maxima in profit landscapes are scattered in a fractal-like fashion: The
number M of local maxima follows the power-law form , but the
scaling exponent is found to differ for different time series. From
comparisons of real and artificial stock prices, we find that the fat-tailed
return distribution is closely related to the exponent observed
for real stock markets. We suggest that the fractality of profit landscape
characterized by can be a useful measure to validate time
series model for stock prices.Comment: 10pages, 6figure
Comment on "Phase transition in a one-dimensional Ising ferromagnet at zero temperature using Glauber dynamics with a synchronous updating mode"
Sznajd-Weron in [Phys. Rev. E {\bf 82}, 031120 (2010)] suggested that the
one-dimensional Ising model subject to the zero temperature synchronous Glauber
dynamics exhibits a discontinuous phase transition. We show here instead that
the phase transition is of a continuous nature and identify critical exponents:
, , and , via a systematic
finite-size scaling analysis.Comment: 2 pages 2 figure
Restructuring of the chaebols and financial sector in Korea
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The role of the government in promoting industrialization and human capital accumulation in Korea
노트 : - This PDF is a selection from an out-of-print volume from the National Bureau of Economic Research
- Volume Title: Growth theories in light of the East Asian experienc
- …