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- research-articleMay 2024
Sequential metamodel‐based approaches to level‐set estimation under heteroscedasticity
AbstractThis paper proposes two sequential metamodel‐based methods for level‐set estimation (LSE) that leverage the uniform bound built on stochastic kriging: predictive variance reduction (PVR) and expected classification improvement (ECI). We show ...
- research-articleJanuary 2020
Uniform Bounds for Invariant Subspace Perturbations
SIAM Journal on Matrix Analysis and Applications (SIMAX), Volume 41, Issue 3Pages 1208–1236https://doi.org/10.1137/19M1262760For a fixed symmetric matrix $A$ and symmetric perturbation $E$ we develop purely deterministic bounds on how invariant subspaces of $A$ and $A+E$ can differ when measured by a suitable “rowwise” metric rather than via traditional measures of subspace ...
- research-articleJuly 2018
ABRA: Approximating Betweenness Centrality in Static and Dynamic Graphs with Rademacher Averages
ACM Transactions on Knowledge Discovery from Data (TKDD), Volume 12, Issue 5Article No.: 61, Pages 1–38https://doi.org/10.1145/3208351ABPA Ξ AΣ (ABRAXAS): Gnostic word of mystic meaning.
We present ABRA, a suite of algorithms to compute and maintain probabilistically guaranteed high-quality approximations of the betweenness centrality of all nodes (or edges) on both static and fully ...
- articleDecember 2010
A permutation approach to validation
Statistical Analysis and Data Mining (STADM), Volume 3, Issue 6Pages 361–380https://doi.org/10.1002/sam.10096We give a permutation approach to validation (estimation of out‐sample error). One typical use of validation is model selection. We establish the legitimacy of the proposed permutation complexity by proving a uniform bound on the out‐sample error, ...
- research-articleJuly 2010
Uniform bounds on growth in o‐minimal structures
Mathematical Logic Quarterly (E256), Volume 56, Issue 4Pages 406–408https://doi.org/10.1002/malq.200910031AbstractWe prove that a function definable with parameters in an o‐minimal structure is bounded away from ∞ as its argument goes to ∞ by a function definable without parameters, and that this new function can be chosen independently of the parameters in ...
- research-articleNovember 2009
On bounds of shift variance in two-channel multirate filter banks
IEEE Transactions on Signal Processing (TSP), Volume 57, Issue 11Pages 4292–4303https://doi.org/10.1109/TSP.2009.2025981Critically sampled multirate FIR filter banks exhibit periodically shift variant behavior caused by nonideal antialiasing filtering in the decimation stage. We assess their shift variance quantitatively by analysing changes in the output signal when the ...