Physics – Data Analysis – Statistics and Probability
Scientific paper
2008-06-30
Physics
Data Analysis, Statistics and Probability
4 pages and 4 figures
Scientific paper
10.1103/PhysRevLett.101.218701
The evolution of open source software projects in Linux distributions offers a remarkable example of a growing complex self-organizing adaptive system, exhibiting Zipf's law over four full decades. We present three tests of the usually assumed ingredients of stochastic growth models that have been previously conjectured to be at the origin of Zipf's law: (i) the growth observed between successive releases of the number of in-directed links of packages obeys Gibrat's law of proportional growth; (ii) the average growth increment of the number of in-directed links of packages over a time interval $\Delta t$ is proportional to $\Delta t$, while its standard deviation is proportional to $\sqrt{\Delta t}$; (iii) the distribution of the number of in-directed links of new packages appearing in evolving versions of Debian Linux distributions has a tail thinner than Zipf's law, with an exponent which converges to the Zipf's law value 1 as the time $\Delta t$ between releases increases.
Krogh von G.
Maillart Thomas
Sornette Didier
Spaeth S.
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