Life-span of families in fossil data forms q-exponential distribution

摘要

The distribution of life span of families known as "skewed profile" is shown to be well-fitted by q-exponential function. It implies the mortality of the families has age-dependent form of proportional to 1/(1 - alphat). This feature is also reproduced by the so-called "size-free" model which was proposed by the present authors. [References: 20]