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  1. Article

    Open Access

    Using network analysis to identify leverage points based on causal loop diagrams leads to false inference

    Network analysis is gaining momentum as an accepted practice to identify which factors in causal loop diagrams (CLDs)—mental models that graphically represent causal relationships between a system’s factors—ar...

    Loes Crielaard, Rick Quax, Alexia D. M. Sawyer, Vítor V. Vasconcelos in Scientific Reports (2023)

  2. Article

    Open Access

    Understanding the impact of exposure to adverse socioeconomic conditions on chronic stress from a complexity science perspective

    Chronic stress increases chronic disease risk and may underlie the association between exposure to adverse socioeconomic conditions and adverse health outcomes. The relationship between exposure to such condit...

    Loes Crielaard, Mary Nicolaou, Alexia Sawyer, Rick Quax, Karien Stronks in BMC Medicine (2021)

  3. Article

    Open Access

    Evaluating the performance of multivariate indicators of resilience loss

    Various complex systems, such as the climate, ecosystems, and physical and mental health can show large shifts in response to small changes in their environment. These ‘tip** points’ are notoriously hard to ...

    Els Weinans, Rick Quax, Egbert H. van Nes, Ingrid A. van de Leemput in Scientific Reports (2021)

  4. Article

    Open Access

    Map** the multicausality of Alzheimer’s disease through group model building

    Alzheimer’s disease (AD) is a complex, multicausal disorder involving several spatiotemporal scales and scientific domains. While many studies focus on specific parts of this system, the complexity of AD is ra...

    Jeroen F. Uleman, René J. F. Melis, Rick Quax, Eddy A. van der Zee in GeroScience (2021)

  5. Article

    Open Access

    Questionnaire data analysis using information geometry

    The analysis of questionnaires often involves representing the high-dimensional responses in a low-dimensional space (e.g., PCA, MCA, or t-SNE). However questionnaire data often contains categorical variables ...

    Omri Har-Shemesh, Rick Quax, J. Stephen Lansing, Peter M. A. Sloot in Scientific Reports (2020)

  6. Article

    Open Access

    Bridging the gap between complexity science and clinical practice by formalizing idiographic theories: a computational model of functional analysis

    The past decades of research have seen an increase in statistical tools to explore the complex dynamics of mental health from patient data, yet the application of these tools in clinical practice remains uncom...

    Julian Burger, Date C. van der Veen, Donald J. Robinaugh, Rick Quax in BMC Medicine (2020)

  7. Article

    Open Access

    Game of neutrophils: modeling the balance between apoptosis and necrosis

    Neutrophils are one of the key players in the human innate immune system (HIIS). In the event of an insult where the body is exposed to inflammation triggering moieties (ITMs), neutrophils are mobilized toward...

    Alva Presbitero, Emiliano Mancini, Filippo Castiglione in BMC Bioinformatics (2019)

  8. Article

    Open Access

    Inferring causation from time series in Earth system sciences

    The heart of the scientific enterprise is a rational effort to understand the causes behind the phenomena we observe. In large-scale complex dynamical systems such as the Earth system, real experiments are rar...

    Jakob Runge, Sebastian Bathiany, Erik Bollt, Gustau Camps-Valls in Nature Communications (2019)

  9. No Access

    Article

    Inferring epidemiological parameters from phylogenetic information for the HIV-1 epidemic among MSM

    The HIV-1 epidemic in Europe is primarily sustained by a dynamic topology of sexual interactions among MSM who have individual immune systems and behavior. This epidemiological process shapes the phylogeny of ...

    Rick Quax, David A. M. C. van de Vijver in The European Physical Journal Special Topi… (2013)

  10. No Access

    Article

    Towards understanding the behavior of physical systems using information theory

    One of the goals of complex network analysis is to identify the most influential nodes, i.e., the nodes that dictate the dynamics of other nodes. In the case of autonomous systems or transportation networks, h...

    Rick Quax, Andrea Apolloni in The European Physical Journal Special Topi… (2013)

  11. Article

    Open Access

    Information dissipation as an early-warning signal for the Lehman Brothers collapse in financial time series

    In financial markets, participants locally optimize their profit which can result in a globally unstable state leading to a catastrophic change. The largest crash in the past decades is the bankruptcy of Lehma...

    Rick Quax, Drona Kandhai, Peter M. A. Sloot in Scientific Reports (2013)

  12. Article

    Open Access

    Increasing risk behaviour can outweigh the benefits of antiretroviral drug treatment on the HIV incidence among men-having-sex-with-men in Amsterdam

    The transmission through contacts among MSM (men who have sex with men) is one of the dominating contributors to HIV prevalence in industrialized countries. In Amsterdam, the capital of the Netherlands, the MS...

    Shan Mei, Rick Quax, David van de Vijver, Yifan Zhu, P M A Sloot in BMC Infectious Diseases (2011)