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Quantum-behaved Particle Swarm Optimization algorithm is analyzed, contraction-expansion coefficient and its control method are studied. To the different performance characteristics with different coefficients control strategies, a control method of coefficient with Q-learning is proposed. The...
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Using a sample of Chinese security analysts' recommendations from 2005 to 2010, we examine the source of analysts' superiority and the investment value of their recommendations. Using a calendar-time portfolio approach, we find that, on average, analysts' recommendations are valuable and that...
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