King effect
In statistics, economics, and econophysics, the king effect is the phenomenon in which the top one or two members of a ranked set show up as clear outliers. These top one or two members are unexpectedly large because they do not conform to the statistical distribution or rank-distribution which the remainder of the set obeys.
Distributions typically followed include the power-law distribution,[2] that is a basis for the stretched exponential function,[1][3] and parabolic fractal distribution. The King effect has been observed in the distribution of:
- French city sizes (where the point representing Paris is the "king", failing to conform to the stretched exponential[1]), and similarly for other countries with a primate city, such as the United Kingdom (London), and the extreme case of Bangkok (see list of cities in Thailand).
- Country populations (where only the points representing China and India fail to fit a stretched exponential[1]).
Note, however, that the king effect is not limited to outliers with a positive evaluation attached to their rank: for rankings on an undesirable attribute, there may exist a pauper effect, with a similar detachment of extremely ranked data points from the reasonably distributed portion of the data set.[citation needed]
See also
[edit | edit source]References
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