Fat tails, long memory, maturity and ageing in open-source software projects

Details Fat tails, long memory, maturity and ageing in open-source software projects Fat tails, long memory, maturity and ageing in open-source software projects

2008-02-21

arxiv.org/abs/0802.3170v1

Physics

Physics and Society

14 pages, 18 figures. Feel free to ask one of the authors for a pdf file with high-quality figures

Scientific paper

We report activity data analysis on several open source software projects, focusing on time between modifications and on the number of files modified at once. Both have fat-tailed distributions, long-term memory, and display systematic non-trivial cross-correlations, suggesting that quiet periods are followed by cascading modifications. In addition the maturity of a software project can be measured from the exponent of the distribution of inter-modification time. Finally, the dynamics of a single file displays ageing, the average rate of modifications decaying as a function of time following a power-law.

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