Results 21 to 30 of about 13,606,645 (327)

Measuring the Topological Time Irreversibility of Time Series With the Degree-Vector-Based Visibility Graph Method

open access: yesFrontiers in Physics, 2021
Time irreversibility of a time series, which can be defined as the variance of properties under the time-reversal transformation, is a cardinal property of non-equilibrium systems and is associated with predictability in the study of financial time ...
Ryutaro Mori, Ruiyun Liu, Yu Chen
doaj   +1 more source

Targeted model evaluations for climate services: A case study on heat waves in Bangladesh

open access: yesClimate Risk Management, 2020
Though not a sufficient condition, the ability to reproduce key elements of climate variability over the historical record should be a minimum requirement for placing any confidence in a model’s climate forecasts or projections of climate change.
Hannah Nissan   +2 more
doaj   +1 more source

Time series analysis in environmental epidemiology: challenges and considerations

open access: yesInternational Journal of Occupational Medicine and Environmental Health, 2023
In environmental epidemiology, time series analyses represent a widely used statistical tool. However, though being commonly used, there is soften confusion regarding the specific requirements, such as which link function might be most appropriate, when ...
Sandra Gudziunaite   +3 more
doaj   +1 more source

Contracts, Business Models and Barriers to Investing in Low Temperature District Heating Projects

open access: yesApplied Sciences, 2019
Approximately 1.2 EJ of energy are potentially available for recovery each year from urban heat sources in the EU. This corresponds to more than 10 percent of the EU’s total energy demand for heat and hot water.
Kristina Lygnerud   +2 more
doaj   +1 more source

EVALUATING THE IMPACT OF DATA.GOV.RO ON THE ACADEMIC RESEARCH [PDF]

open access: yesAnalele Universităţii Constantin Brâncuşi din Târgu Jiu : Seria Economie, 2022
In the context of the digital revolution, data is the most valuable resource which gains in value the more it is used. Freely available open source data and institutional data repositories encourage and connect, both academia and industry.
MIRICĂ ANDREEA, PETCU IONELA-ROXANA
doaj  

A Parametric Factor Model of the Term Structure of Mortality

open access: yesEconometrics, 2019
The prototypical Lee–Carter mortality model is characterized by a single common time factor that loads differently across age groups. In this paper, we propose a parametric factor model for the term structure of mortality where multiple factors are
Niels Haldrup   +1 more
doaj   +1 more source

The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis

open access: yesProceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences, 1998
A new method for analysing nonlinear and non-stationary data has been developed. The key part of the method is the ‘empirical mode decomposition’ method with which any complicated data set can be decomposed into a finite and often small number of ...
Norden E. Huang   +8 more
semanticscholar   +1 more source

Exploring Progress in Multivariate Time Series Forecasting: Comprehensive Benchmarking and Heterogeneity Analysis [PDF]

open access: yesIEEE Transactions on Knowledge and Data Engineering, 2023
Multivariate Time Series (MTS) analysis is crucial to understanding and managing complex systems, such as traffic and energy systems, and a variety of approaches to MTS forecasting have been proposed recently.
Zezhi Shao   +11 more
semanticscholar   +1 more source

Hybrid Time Series Method for Long-Time Temperature Series Analysis

open access: yesDiscrete Dynamics in Nature and Society, 2021
This paper combines discrete wavelet transform (DWT), autoregressive moving average (ARMA), and XGBoost algorithm to propose a weighted hybrid algorithm named DWTs-ARMA-XGBoost (DAX) on long-time temperature series analysis.
Guangdong Huang, Jiahong Li
doaj   +1 more source

Mandelbrot's Stochastic Time Series Models

open access: yesEarth and Space Science, 2019
I survey and illustrate the main time series models that Mandelbrot introduced into time series analysis in the 1960s and 1970s. I focus particularly on the members of the additive fractional stable family including Lévy flights and fractional Brownian ...
N. W. Watkins
doaj   +1 more source

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