Results 301 to 310 of about 205,970 (321)

Ecological and methodological drivers of non‐stationarity in tree growth response to climate

Global Change Biology, 2022
Radial tree growth is sensitive to environmental conditions, making observed growth increments an important indicator of climate change effects on forest growth.
Jan Tumajer   +10 more
semanticscholar   +1 more source

Geographically neural network weighted regression for the accurate estimation of spatial non-stationarity

International Journal of Geographical Information Science, 2020
Geographically weighted regression (GWR) is a classic and widely used approach to model spatial non-stationarity. However, the approach makes no precise expressions of its weighting kernels and is insufficient to estimate complex geographical processes ...
Zhenhong Du   +4 more
semanticscholar   +1 more source

Understanding Notions of Stationarity in Nonsmooth Optimization: A Guided Tour of Various Constructions of Subdifferential for Nonsmooth Functions

IEEE Signal Processing Magazine, 2020
Many contemporary applications in signal processing and machine learning give rise to structured nonconvex nonsmooth optimization problems that can often be tackled by simple iterative methods quite effectively.
Jiajin Li, A. M. So, Wing-Kin Ma
semanticscholar   +1 more source

Testing for Stationarity in Heterogeneous Panel Data

, 2000
This paper proposes a residual-based Lagrange multiplier (LM) test for a null that the individual observed series are stationary around a deterministic level or around a deterministic trend against the alternative of a unit root in panel data.
K. Hadri
semanticscholar   +1 more source

Online Stochastic Optimization with Wasserstein Based Non-stationarity

Management Sciences, 2020
We consider a general online stochastic optimization problem with multiple resource constraints over a horizon of finite time periods. In each time period, a reward function and multiple cost functions are revealed, and the decision maker needs to ...
Jiashuo Jiang   +2 more
semanticscholar   +1 more source

How pore structure non‐stationarity compromises flow properties representativity (REV) for soil samples: Pore‐scale modelling and stationarity analysis

European Journal of Soil Science, 2020
Classic soil physics relies heavily on the concept of representative elementary volume (REV), which is necessary to perform upscaling from the studied soil samples and parameterize continuum scale hydrological models (e.g., based on Richards or Darcy ...
K. Gerke, M. Karsanina
semanticscholar   +1 more source

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