Clustering

Collective dynamics of stock market efficiency
Summarized by the efficient market hypothesis, the idea that stock prices fully reflect all available information is always confronted …
Luiz G. A. Alves, Higor Y. D. Sigaki, Matjaž Perc, Haroldo V. Ribeiro
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Collective dynamics of stock market efficiency
The hidden traits of endemic illiteracy in cities
In spite of the considerable progress towards reducing illiteracy rates, many countries, including developed ones, have encountered …
Luiz G. A. Alves, José S. Andrade Jr, Quentin S. Hanley, Haroldo V. Ribeiro
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The hidden traits of endemic illiteracy in cities
Spatial correlations, clustering and percolation-like transitions in homicide crimes
The spatial dynamics of criminal activities has been recently studied through statistical physics methods; however, models and results …
Luiz G. A. Alves, Ervin K. Lenzi, Renio S. Mendes, Haroldo V. Ribeiro
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Spatial correlations, clustering and percolation-like transitions in homicide crimes
Long-range spatial correlations and fluctuation statistics of lightning activity rates in Brazil
We report on a statistical analysis of the lightning activity rates in all Brazilian cities. We find out that the average of lightning …
Haroldo V. Ribeiro, Fernando J. Antonio, Luiz G. A. Alves, Ervin K. Lenzi, Renio S. Mendes
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Long-range spatial correlations and fluctuation statistics of lightning activity rates in Brazil