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LIFE-SPAN OF FAMILIES IN FOSSIL DATA FORMSq-EXPONENTIAL DISTRIBUTION

Author

Listed:
  • TAKASHI SHIMADA

    (Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan)

  • SATOSHI YUKAWA

    (Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan)

  • NOBUYASU ITO

    (Department of Applied Physics, School of Engineering, The University of Tokyo, Bunkyo-ku, Hongo, Tokyo 113-8656, Japan)

Abstract

The distribution of life span of families known as "skewed profile" is shown to be well-fitted byq-exponential function. It implies the mortality of the families has age-dependent form of∝1/(1-αt). This feature is also reproduced by the so-called "size-free" model which was proposed by the present authors.

Suggested Citation

  • Takashi Shimada & Satoshi Yukawa & Nobuyasu Ito, 2003. "LIFE-SPAN OF FAMILIES IN FOSSIL DATA FORMSq-EXPONENTIAL DISTRIBUTION," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 14(09), pages 1267-1271.
    • Handle: RePEc:wsi:ijmpcx:v:14:y:2003:i:09:n:s0129183103005406
    DOI: 10.1142/S0129183103005406
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    References listed on IDEAS

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    1. Perez, A.A, 2001. "Comment on “On the multinomial logic model” [Physica A 269 (1999) 9–15]," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 289(3), pages 606-606.
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