We develop non-parametric instrumental variable estimation and inferential theory for econometric models with possibly endogenous regressors whose coefficients can vary over time either deterministically or stochastically, the time-varying uniform versions of standard Hausman exogeneity test. After deriving asymptotic properties proposed procedures, we assess their finite sample performance by ...

Time-varying media have recently emerged as a new paradigm for wave manipulation, due to the synergy between discovery of highly nonlinear materials, such epsilon-near-zero and quest applications, magnet-free nonreciprocity, multimode light shaping, ultrafast switching. In this review, we provide comprehensive discussion recent progress achieved with photonic metamaterials whose properties stem...

Abstract Time-varying graphs (TVGs) enable the study and understanding of dynamics many real-world networked systems. The notion centrality in TVG scenarios generally refers to metrics that assess relative importance nodes over time evolution a complex dynamic network. In contrast, Time Centrality, which evaluates instants networks, is still little explored. Indeed, few works on Centrality base...