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Pn ≈ 1/na
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where Pn is the frequency of
occurrence of the nth
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ranked item,
and a is some constant.
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The
probability of occurrence of a value of some variable
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starts high
and tapers off. Thus, a few values occur very
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often while
many others occur rarely.
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Pareto for
land ownership in the 1800s
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Zipf for word
frequency
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Also known as
the 80/20 rule and as Zipf-Mandelbrot
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Used to
measure of citings per paper:
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# of papers cited n times is about 1/na
of those being
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cited once,
where a ≈ ____
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