Results 171 to 180 of about 96,433 (236)

The Birth–death Processes with Regular Boundary: Stationarity and Quasi-stationarity

Acta Mathematica Sinica, English Series, 2022
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Gao, Wu Jun, Mao, Yong Hua, Zhang, Chi
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TimeBridge: Non-Stationarity Matters for Long-term Time Series Forecasting

International Conference on Machine Learning
Non-stationarity poses significant challenges for multivariate time series forecasting due to the inherent short-term fluctuations and long-term trends that can lead to spurious regressions or obscure essential long-term relationships.
Peiyuan Liu, Beiliang Wu, Yifan Hu, Naiqi Li, Tao Dai, Jigang Bao, Shu-Tao Xia   +6 more
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, Xiaocheng Li, Jiawei Zhang   +2 more
semanticscholar   +1 more source

K-stationarity and wavelets

Journal of Statistical Planning and Inference, 1998
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Cheng, Bing, Tong, Howell
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U-Mixer: An Unet-Mixer Architecture with Stationarity Correction for Time Series Forecasting

AAAI Conference on Artificial Intelligence
Time series forecasting is a crucial task in various domains. Caused by factors such as trends, seasonality, or irregular fluctuations, time series often exhibits non-stationary.
Xiang Ma, Xuemei Li, Lexin Fang, Tianlong Zhao, Caiming Zhang   +4 more
semanticscholar   +1 more source

Stationarity of the human electroencephalogram

Medical and Biological Engineering and Computing, 1977
The time and frequency domain characteristics of the human electroencephalogram continue to be parameters of significant interest to both research workers and clinicians alike. In nearly every analysis of the e.e.g., the question of stationarity is raised.
B A, Cohen, A, Sances
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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

STATIONARITY OF DELAYED SUBORDINATORS

Stochastic Models, 2001
It is shown that, analogous to partial-sum processes in renewal theory, nondecreasing Levy processes (subordinators) can be delayed such as to show a certain stationarity.
Harn, van, K., Steutel, F.W.
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Time Series Analysis (Stationarity, Cointegration, and Causality)

Environmental Kuznets Curve (EKC), 2019
Recently, the literature of environmental economics witnesses a plethora of research to test the environmental Kuznets curve (EKC) which is based on the time series analysis. The researchers postulate that the time series analysis is more relevant in the
A. Jalil, N. Rao
semanticscholar   +1 more source

Trend Stationarity vs. Difference Stationarity

1996
AbstractThis chapter introduces difference stationarity (DS) and trend stationarity (TS) as two non-nested, separate hypotheses. TS is represented as an MA unit-root in Δxt, and as a limit of a sequence of the DS models. The DS is represented as a limit of a sequence of TS models. Data relevant to the discrimination between the DS and TS are explained.
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