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101.
本文考察了物理学中因果性概念的演变过程,阐述了亚里士多德自然哲学、牛顿力学、相对论和量子力学中的因果性概念. 相似文献
102.
In recent years the singular spectrum analysis (SSA) technique has been further developed and applied to many practical problems. The aim of this research is to extend and apply the SSA method, using the UK Industrial Production series. The performance of the SSA and multivariate SSA (MSSA) techniques was assessed by applying it to eight series measuring the monthly seasonally unadjusted industrial production for the main sectors of the UK economy. The results are compared with those obtained using the autoregressive integrated moving average and vector autoregressive models. We also develop the concept of causal relationship between two time series based on the SSA techniques. We introduce several criteria which characterize this causality. The criteria and tests are based on the forecasting accuracy and predictability of the direction of change. The proposed tests are then applied and examined using the UK industrial production series. Copyright © 2012 John Wiley & Sons, Ltd. 相似文献
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1.M·玻恩的因果观:量子世界是因果与机遇联合支配的;量子粒子具有内禀不确定性,机遇律是终极自然律;几率、机遇的概念比因果更为基本。2.D·玻姆的量子势因果观:自然界根本不存在终级自然律,而且每一层次都突现独特的规律。因果性只是相对的必然性。偶然性总是出现在多种不同因素、可能趋势的交叉点上。量子势因果解释是因果决定性与概率统计性的某种整合。它在物理上有清晰的直观模型;在哲学上有明确的本体论基础。 相似文献
105.
Kenneth Aizawa 《Studies in history and philosophy of science》2010,41(3):227-236
It is sometimes suggested that the history of computation in cognitive science is one in which the formal apparatus of Turing-equivalent computation, or effective computability, was exported from mathematical logic to ever wider areas of cognitive science and its environs. This paper, however, indicates some respects in which this suggestion is inaccurate. Computability theory has not been focused exclusively on Turing-equivalent computation. Many essential features of Turing-equivalent computation are not captured in definitions of computation as (digital) symbol manipulation. Turing-equivalent computation did not play the role in McCulloch and Pitts’s early cybernetic work that is sometimes attributed to it. Finally, various segments of the neuroscientific community invoke a notion of computation that differs from the Turing-equivalent notion. 相似文献
106.
运用证券软件搜集到最新的上证50和深证300指数的一年收盘数据,并运用计量经济学理论单位根检验、格兰杰因果检验、协整检验、脉冲反应和Eviews5.0软件对其分析,得出处理的数据结果,并对数据信息进行分析,得出相应的结论。 相似文献
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108.
对湖北省2001年1月至2010年11月的CPI和PPI进行了协整检验和格兰杰因果关系检验,结果显示,在所检验的时间区间,CPI与PPI存在长期均衡关系,CPI和PPI之间在滞后1~3个月的基础上互为格兰杰因果关系,而直到滞后13个月,CPI一直是PPI的格兰杰原因,说明短期存在PPI和CPI的相互价格传递,长期存在着CPI向PPI的价格传递;建立了PPI关于CPI滞后项的二次回归模型,指出t期PPI是(t-1)期CPI的一元二次函数;通过对2010年12月PPI的真实值和根据函数拟合得到的预测值进行对比分析,验证了模型的可靠性. 相似文献
109.
Stephen Palmquist 《Foundations of Science》2007,12(1):9-37
After sketching the historical development of “emergence” and noting several recent problems relating to “emergent properties”,
this essay proposes that properties may be either “emergent” or “mergent” and either “intrinsic” or “extrinsic”. These two
distinctions define four basic types of change: stagnation, permanence, flux, and evolution. To illustrate how emergence can
operate in a purely logical system, the Geometry of Logic is introduced. This new method of analyzing conceptual systems involves
the mapping of logical relations onto geometrical figures, following either an analytic or a synthetic pattern (or both together).
Evolution is portrayed as a form of discontinuous change characterized by emergent properties that take on an intrinsic quality
with respect to the object(s) or proposition(s) involved. Causal leaps, not continuous development, characterize the evolution
of human life in a developing foetus, of a thought out of certain brain states, of a new idea (or insight) out of ordinary
thoughts, and of a great person out of a set of historical experiences. The tendency to assume that understanding evolutionary
change requires a step-by-step explanation of the historical development that led to the appearance of a certain emergent
property is thereby discredited. 相似文献
110.
中国股票市场流动性与收益动态关系研究 总被引:19,自引:0,他引:19
应用向量自回归(VAR)方法和格兰杰非因果性检验等计量经济方法,研究了中国股票市场流动性和收益的动态关系.研究表明,随着中国证券市场的发展,市场流动性特征也在发生变化,2002年中国股票市场出现了"非流动性溢价"现象. 相似文献