2011 年 131 巻 10 号 p. 1828-1829
Power-law distributions have been found in natural and social phenomena (known as ‘power-law’). City population studies have shown that the power-law holds for relations between city sizes and their ranks. Here population distributions of Okinawa islands are examined using census data from 1955 to 2005. Obtained results reveal that sizes of islands populations provide power-law distributions. Furthermore, power-law distributions are observed in sizes of population shifts for a range of periods from five years to 50 years. The spatio-temporal structure may shed light on self-organizing mechanisms underlying power-law distributions.
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