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.
• 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.
• 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 eighteen months. Outlined in 1965 by Gordon Moore, co-founder of the Intel Corporation.
• 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 - David P. Reed The utility of large networks, particularly social networks, scales exponentially with the size of the network.
• Reilly's law - People generally patronize the largest mall in the area.
• Zipf's law - For many different kinds of things, their frequency is observed to be approximately inversely proportional to their rank order.

See also

• Eponym
• Etymology
• Lists of etymologies
• List of eponymous laws