Results 121 to 130 of about 1,114,580 (407)

Seasonal integration and the evolving seasonals model

International Journal of Forecasting, 1997
Abstract The paper uses a model of seasonality popular in the 1960s, the evolving seasonals model, to explore issues relating to testing for unit roots in seasonal time series. The model is used to show how data can be transformed in such a way that tests for seasonal integration simply become those for regular unit roots.
Hylleberg, Svend, Pagan, Adrian R.
openaire   +3 more sources

Climate seasonality limits leaf carbon assimilation and wood productivity in tropical forests

, 2016
The seasonal climate drivers of the carbon cycle in tropical forests remain poorly known, although these forests account for more carbon assimilation and storage than any other terrestrial ecosystem. Based on a unique combination of seasonal pan-tropical
F. Wagner, B. Hérault, D. Bonal, C. Stahl, L. Anderson, T. Baker, Gabriel Sebastian Becker, H. Beeckman, Danilo Boanerges Souza, P. Botosso, D. Bowman, A. Bräuning, Benjamin Brede, Foster Brown, J. Camarero, P. Camargo, F. C. Cardoso, F. A. Carvalho, W. Castro, Rubens Koloski Chagas, J. Chave, E. Chidumayo, D. Clark, F. Costa, Camille Couralet, Paulo Maurício, H. Dalitz, V. R. Castro, J. D. F. Milani, Edilson Consuelo de Oliveira, Luciano de Souza Arruda, Jean-Louis Devineau, D. Drew, O. Dünisch, G. Durigan, E. Elifuraha, M. Fedele, L. Fedele, A. F. Filho, César Augusto Guimarães Finger, A. Franco, João Lima Freitas Júnior, F. Galvão, A. Gebrekirstos, Robert Gliniars, P. Graça, A. Griffiths, J. Grogan, K. Guan, J. Homeier, M. Kanieski, L. Kho, J. Koenig, S. V. Kohler, Julia Krepkowski, J. P. Lemos-Filho, D. Lieberman, M. Lieberman, C. Lisi, Tomaz Longhi Santos, J. Ayala, E. Maeda, Y. Malhi, Vivian R. B. Maria, M. Marques, R. Marques, Hector Maza Maza Chamba, L. Mbwambo, K. Melgaço, Hooz A. Mendivelso, B. Murphy, Joseph John O’Brien, S. Oberbauer, Naoki Okada, R. Pélissier, L. Prior, F. Roig, M. Ross, D. Rossatto, Vivien Rossi, L. Rowland, E. Rutishauser, H. Santana, M. Schulze, D. Selhorst, W. Silva, M. Silveira, Susanne Spannl, M. Swaine, J. J. Toledo, M. M. Toledo, M. Toledo, T. Toma, M. T. Filho, J. Hernández, J. Verbesselt, S. Vieira, Grégoire Laurent Vincent, C. Castilho, F. Volland, M. Worbes, M. Zanon, L. Aragão   +102 more
semanticscholar   +1 more source

Deterministic versus Stochastic Seasonal Fractional Integration and Structural Breaks [PDF]

This paper considers a general model which allows for both deterministic and stochastic forms of seasonality, including fractional (stationary and nonstationary) orders of integration, and also incorporating endogenously determined structural breaks ...
Guglielmo Maria Caporale, Juncal Cunado, Luis A. Gil-Alana   +2 more
core  

Temperature and Farm Labor in Nigeria

Applied Economic Perspectives and Policy, EarlyView.
ABSTRACT We estimate the impact of temperature shocks on the composition of farm labor in rural Nigeria using a nationally representative household panel survey. Leveraging plausibly exogenous year‐to‐year variation in growing season temperatures, we find that warmer temperatures significantly alter farm labor composition, prompting a substantial shift
Andu Berha
wiley   +1 more source

Monitoring Changes to Small-Sized Lakes Using Medium Spatial and Temporal Satellite Imagery in the Badain Jaran Desert from 2015 to 2020

International Journal of Crowd Science
The Badain Jaran Desert is the second-largest desert in China, and its lakes, which are generally small-sized and highly dynamic, play a significant role for plants and animals in this arid region.
Qinyu Zhao, Luyan Ji, Yonggang Su, Kai Yu, Yongchao Zhao   +4 more
doaj   +1 more source

Generative Artificial Intelligence Shaping the Future of Agri‐Food Innovation

AgriFood: Journal of Agricultural Products for Food, EarlyView.
Emerging use cases of generative artificial intelligence in agri‐food innovation. ABSTRACT The recent surge in generative artificial intelligence (AI), typified by models such as GPT, diffusion models, and large vision‐language architectures, has begun to influence the agri‐food sector.
Jun‐Li Xu, Dimitrios Argyropoulos, Tamíris da Costa   +2 more
wiley   +1 more source

Impact of Ants on the Order Composition of Canopy Arthropod Communities in Temperate and Tropical Forests

Animals
Ants are key drivers of biodiversity in both tropical and temperate forests, though the underlying mechanisms of this remain debated. In tropical lowland rainforests, ants dominate the canopy as opportunistic predators, shaping arthropod abundance and ...
Andreas Floren, Tobias Müller
doaj   +1 more source

Seasonal variability of the Canary Current: A numerical study [PDF]

, 2011
Evan Mason, François Colas, Jeroen Molemaker, Alexander F. Shchepetkin, Charles Troupin, James C. McWilliams, Pablo Sangrà   +6 more
openalex   +1 more source

Seasonality and Non-Trading Effect on Central European Stock Markets (in English) [PDF]

This paper investigates seasonality and non-trading effects on central European stock markets within the framework of a periodic autoregressive model for both the mean and the volatility of stock returns.
Filip Žikeš, Vít Bubák
core  

Volatility analysis and forecasting of vegetable prices using an ARMA‐GARCH model: An application of the CF filter and seasonal adjustment method to Korean green onions

Agribusiness, EarlyView.
Abstract The vegetable market experiences significant price fluctuations due to the complex interplay of trend, cyclical, seasonal, and irregular factors. This study takes Korean green onions as an example and employs the Christiano–Fitzgerald filter and the CensusX‐13 seasonal adjustment methods to decompose its price into four components: trend ...
Yiyang Qiao, Byeong‐il Ahn
wiley   +1 more source