arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0806.1909physics.soc-ph
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城市人口的形成动力与分布函数

Formation dynamics and distribution function of cities population

B. R. Gadjiev, M. A. Korolev, T. B. Progulova

摘要:

通过数据分析,我们在不同的结构单元,即地区、联邦区和整个国家的水平上定义了针对人口的分布函数。研究了由于结构单元的增大而引起的分布函数变形的特点。利用主方程的连续近似,我们得到了具有对称跃迁率的分布函数的Fokker-Plank方程。此外,我们提供了一个模型,只有相邻状态之间的过渡是可能的。此外,在这种情况下,它提出的任何状态的输入和输出的转移概率率是不同的,我们定义的条件,这两个模型的形式等价的问题所描述的随机微分方程的加性和乘性白噪声。我们分析了Ito和Stratonovich微积分中相应的Fokker-Plank方程,得到了Tsallis分布型的解。我们证明了理论结果与水平的累积分布的数据分析的比较。我们采用了极大似然法进行拟合。所得到的结果使我们能够属性的Tsallis分布nonextensivity参数的经验曲线的具体值。

英文摘要:

From the data analysis we defined distribution function against the population on the level of various structure units, namely regions, federal districts and the country on the whole. We have studied peculiarities of the distribution function deformation due to the structure units' enlargement. Using the master equation in the continuous approximation, we obtain the Fokker-Plank equation for the distribution function with symmetric transition rates. In addition, we offer a model where transitions only between neighbour states are possible. Moreover in this case it is proposed the in and out transition probability rate for any states are different We define condition for the formal equivalence of both models to the problem that is described by the stochastic differential equation with additive and multiplicative white noises. We have analyzed the corresponding Fokker-Plank equation in the Ito and Stratonovich calculus, and obtained a solution of the Tsallis distribution type. We demonstrate a comparison of theoretical results with those of the data analysis on the level a cumulative distributions. We have used the maximum likelihood method for fitting. The obtained results allow us to attribute the specific value of the Tsallis distribution nonextensivity parameter to the empiric curves.

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