1.5k citations · 9.9k across the 39 of their papers we have counts for
41 papers
Breaking the Code: Multi-level Learning in the Eurovision Song Contest
Luís A. Nunes Amaral, Arthur Capozzi, Dirk Helbing
Organizations learn from the market, political, and societal responses to their actions. While in some cases both the actions and responses take place in an open manner, in many ot…
Spreader events and the limitations of projected networks for capturing dynamics on multipartite networks
Hyojun A. Lee, Luiz G. A. Alves, Luís A. Nunes Amaral
Many systems of scientific interest can be conceptualized as multipartite networks. Examples include the spread of sexually transmitted infections, scientific collaborations, human…
The Distribution of the Asymptotic Number of Citations to Sets of Publications by a Researcher or From an Academic Department Are Consistent With a Discrete Lognormal Model
João A. G. Moreira, Xiao Han T. Zeng, Luís A. Nunes Amaral
How to quantify the impact of a researcher's or an institution's body of work is a matter of increasing importance to scientists, funding agencies, and hiring committees. The use o…
Scaling and optimal synergy: Two principles determining microbial growth in complex media
Francesco Alessandro Massucci, Roger Guimerà, Luís A. Nunes Amaral +1
High-throughput experimental techniques and bioinformatics tools make it possible to obtain reconstructions of the metabolism of microbial species. Combined with mathematical frame…
A high-reproducibility and high-accuracy method for automated topic classification
Andrea Lancichinetti, M. Irmak Sirer, Jane X. Wang +3
Much of human knowledge sits in large databases of unstructured text. Leveraging this knowledge requires algorithms that extract and record metadata on unstructured text documents.…
Correlations between user voting data, budget, and box office for films in the Internet Movie Database
Max Wasserman, Satyam Mukherjee, Konner Scott +3
The Internet Movie Database (IMDb) is one of the most-visited websites in the world and the premier source for information on films. Like Wikipedia, much of IMDb's information is u…
The role of mentorship in protege performance
R. Dean Malmgren, Julio M. Ottino, Luis A. N. Amaral
The role of mentorship on protege performance is a matter of importance to academic, business, and governmental organizations. While the benefits of mentorship for proteges, mentor…
Module identification in bipartite and directed networks
R. Guimera, M. Sales-Pardo, L. A. N. Amaral
Modularity is one of the most prominent properties of real-world complex networks. Here, we address the issue of module identification in two important classes of networks: biparti…
Levels of Complexity in Scale-Invariant Neural Signals
Plamen Ch. Ivanov, Jeffrey M. Hausdorff, S. Havlin +5
Many physical and physiological signals exhibit complex scale-invariant features characterized by scaling and long-range power-law correlations, suggesting a possibly common…
Non-Lévy Distribution of Commodity Price Fluctuations
Kaushik Matia, Luis A. Nunes Amaral, Stephen P. Goodwin +1
Price fluctuations of commodities like cotton and wheat are thought to display probability distributions of returns that follow a Lévy stable distribution. Recent analysis of stock…
Truncation of power law behavior in "scale-free" network models due to information filtering
Stefano Mossa, Marc Barthelemy, H. Eugene Stanley +1
We formulate a general model for the growth of scale-free networks under filtering information conditions--that is, when the nodes can process information about only a subset of th…
Dynamics of Sleep-Wake Transitions During Sleep
Chung-Chuan Lo, Luis A. Nunes Amaral, Shlomo Havlin +4
We study the dynamics of the awakening during the night for healthy subjects and find that the wake and the sleep periods exhibit completely different behavior: the durations of wa…
A Random Matrix Approach to Cross-Correlations in Financial Data
V. Plerou, P. Gopikrishnan, B. Rosenow +3
We analyze cross-correlations between price fluctuations of different stocks using methods of random matrix theory (RMT). Using two large databases, we calculate cross-correlation…
Behavioral-Independent Features of Complex Heartbeat Dynamics
Luis A. Nunes Amaral, Plamen Ch. Ivanov, Naoko Aoyagi +5
We test whether the complexity of cardiac interbeat interval time series is simply a consequence of the wide range of scales characterizing human behavior, especially physical acti…
Robust Patterns in Food Web Structure
J. Camacho, R. Guimera, L. A. N. Amaral
We analyze the properties of seven community food webs from a variety of environments--including freshwater, marine-freshwater interfaces and terrestrial environments. We uncover q…
Analytical solution of a model for complex food webs
Juan Camacho, Roger Guimera, Luis A. N. Amaral
We investigate numerically and analytically a recently proposed model for food webs [Nature {\bf 404}, 180 (2000)] in the limit of large web sizes and sparse interaction matrices.…
Scale Invariance in the Nonstationarity of Physiological Signals
Pedro Bernaola-Galvan, Plamen Ch. Ivanov, Luis A. Nunes Amaral +2
We introduce a segmentation algorithm to probe temporal organization of heterogeneities in human heartbeat interval time series. We find that the lengths of segments with different…
Small-world networks and the conformation space of a lattice polymer chain
A. Scala, L. A. N. Amaral, M. Barthelemy
We map the conformation space of a simple lattice polymer chain to a network, where (i) the vertices of the network have a one-to-one correspondence to the conformations of the cha…
Economic Fluctuations and Diffusion
Vasiliki Plerou, Parameswaran Gopikrishnan, Luis. A. Nunes Amaral +2
Stock price changes occur through transactions, just as diffusion in physical systems occurs through molecular collisions. We systematically explore this analogy and quantify the r…
Sleep-Wake Differences in Scaling Behavior of the Human Heartbeat: Analysis of Terrestrial and Long-Term Space Flight Data
Plamen Ch. Ivanov, Armin Bunde, Luís A. N. Amaral +5
We compare scaling properties of the cardiac dynamics during sleep and wake periods for healthy individuals, cosmonauts during orbital flight, and subjects with severe heart diseas…
Scaling of the distribution of price fluctuations of individual companies
V. Plerou, P. Gopikrishnan, L. A. N. Amaral +2
We present a phenomenological study of stock price fluctuations of individual companies. We systematically analyze two different databases covering securities from the three major…
Erratum: Small-world networks: Evidence for a crossover picture
Marc Barthelemy, Luis A. N. Amaral
We correct the value of the exponent τ.
Ivory Tower Universities and Competitive Business Firms
Vasiliki Plerou, Luis A. Nunes Amaral, Parameswaran Gopikrishnan +2
There is nowadays considerable interest on ways to quantify the dynamics of research activities, in part due to recent changes in research and development (R&D) funding. Here, we s…
Multifractality in Human Heartbeat Dynamics
Plamen Ch. Ivanov, Luís A. Nunes Amaral, Ary L. Goldberger +4
Recent evidence suggests that physiological signals under healthy conditions may have a fractal temporal structure. We investigate the possibility that time series generated by cer…