Long-Tailed Duration Distributions for Disability in Aged People (General)

概要

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Long tails of the duration distributions for disabilities in the aged are analyzed. Log-normal distribution shows excellent fit with various data on the durations of disabilities, irrespective of their severity. Persisting long tails suggest the fractal nature of disability distributions. For approximately 60% of the patients, the duration distributions are also mimicked by the first passage time distribution (FPTD) of one-dimensional Brownian motion. The finding that the data fit the log-normal distribution very well and FPTD fairly well reveals disability for the aged to be a stochastic process of suffering successively from various endogenous diseases, i.e., multiple pathology.
社団法人日本物理学会の論文
2003-10-15