نتایج جستجو برای: seasonal component
تعداد نتایج: 679149 فیلتر نتایج به سال:
Prior studies on the association between weather and psychological changes have produced mixed results. In part, this inconsistency may be because weather's psychological effects are moderated by two important factors: the season and time spent outside. In two correlational studies and an experiment manipulating participants' time outdoors (total N = 605), pleasant weather (higher temperature o...
4 The vast majority of variability in the instrumental surface temperature record is at annual 5 frequencies. Systematic changes in the yearly Fourier component of surface temperature 6 have been observed since the mid-20th century, including a shift towards earlier seasonal 7 transitions over land. Here it is shown that the variability in the amplitude and phase of 8 the annual cycle of surfac...
This study provides a comprehensive comparison of the performance of the commonly used econometric and time-series models in forecasting seasonal tourism demand. The empirical study is carried out based on the demand for outbound leisure tourism by UK residents to seven destination countries: Australia, Canada, France, Greece, Italy, Spain and the USA. In the modelling exercise, the seasonality...
BACKGROUND Observed seasonal differences in particulate matter (PM) associations with human health may be due to their composition and to toxicity-related seasonal interactions. OBJECTIVES We assessed seasonality in PM composition and in vitro PM pro-inflammatory potential using multiple PM samples. METHODS We collected 90 weekly PM10 and PM2.5 samples during the rainy-warm and dry-cold sea...
In this study, we propose an adaptive multiscale ensemble (AME) learning approach, which consists of variational mode decomposition (VMD) and least square support vector regression (LSSVR) for seasonal trend forecasting tourist arrivals. the formulation AME original arrival series is decomposed into trend, seasonal, remaining volatility components. Then, ARIMA used to forecast component, SARIMA...
The topic of finding an effective strategy to halt virus in a complex network is of current interest. We propose an immunization strategy for seasonal epidemics that occur periodically. Based on the local information of the infection status from the previous epidemic season, the selection of vaccinated nodes is optimized gradually. The evolution of vaccinated nodes during iterations demonstrate...
BACKGROUND This study, the first of its kind carried out at sub-national level in Ethiopia, was conducted in order to understand the dynamics of HIV transmission at regional and district level in Tigrai, Ethiopia; and to assess the adequacy of the HIV prevention response. METHODS Routine data from health centres, data from available published and grey literature and studies, and primary quali...
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