Max Planck Institute for Dynamics and Self-Organization -- Department for Nonlinear Dynamics and Network Dynamics Group
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In most large networks, it is impossible to sample the activity of all nodes in parallel. For example, the human brain comprises 80 billion neurons, but current techniques allow sampling the activity from only a few hundred neurons at a time. I showed for collective states of networks that subsampling can severely impede inferences about the properties of the full system. In detail, subsampling in critical models can distort the expected power law relations, and thereby a critical system can be misinterpreted as sub- or super-critical. I am currently developing an approach to overcome subsampling effects by extending methods from finite size scaling theory.