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This article may be too technical for most readers to understand. Please improve this article to make it accessible to non-experts, without removing the technical details. (October 2009) |
In the parabolic fractal distribution, the logarithm of the frequency or size of entities in a population is a quadratic polynomial of the logarithm of the rank. This can markedly improve the fit over a simple power-law relationship (see external link below).
In a number of cases, there is a so-called King effect where the highest-ranked item has a significantly greater frequency or size than the model predicts on the basis of the other items.
Definition
The probability mass function is given, as a function of the rank n, by
See also
External links
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