List of observations named after people

This is a list of observations named after people (eponymous observations). For other lists of eponyms, see eponym.

Benford's law - In any collection of statistics, a given statistic has roughly a thirty percent chance of starting with the digit one.
Boyle's Law - The pressure (P) and Volume (V) of an ideal gas of fixed mass and temperature is related by P x V = K, where K is a constant. Named after Robert Boyle.
Duverger's law - Winner-take-all electoral systems tend to create a two party system, while proportional representation tends to create a multiple party system. Named after Maurice Duverger.
Grimm's law - Explains correspondence between some consonants in Germanic languages vs. other Indo-European languages. Discovered by Jacob Grimm, one of the Brothers Grimm.
Hotelling's law - Under some conditions, it is rational for competitors to make their products as nearly identical as possible. Named after Harold Hotelling.
Little's law - The average number of customers in a stable system (over some time interval) is equal to their average arrival rate, multiplied by their average time in the system. The law was named for John Little.
Metcalfe's law - In network theory, the value of a system grows as approximately the square of the number of users of the system. Framed by Robert Metcalfe.
Moore's law - The complexity of integrated circuits doubles every 24 months. Outlined in 1965 by Gordon Moore, co-founder of the Intel Corporation.
Murphy's law - ''Anything that can go wrong will go wrong.
Poisson's law of large numbers - For independent random variables with a common distribution, the average value for a sample tends to the mean as sample size increases. Named after Siméon-Denis Poisson.
Reed's law - ''The utility of large networks, particularly social networks, scales exponentially with the size of the network. Named after David P. Reed.
Reilly's law - People generally patronize the largest mall in the area.
Rock's law - The cost of a semiconductor chip fabrication plant doubles every four years. Named after Arthur Rock.
Zipf's law - For many different kinds of things, their frequency is observed to be approximately inversely proportional to their rank order.. Named after George Kingsley Zipf.
Wilcox-McCandlish Law of Online Discourse Evolution - The chance of success of any attempt to change the topic or direction of a thread of discussion in a networked forum is directly proportional to the quality of the current content.

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