نتایج جستجو برای: مدل arima
تعداد نتایج: 122901 فیلتر نتایج به سال:
BACKGROUNDS/OBJECTIVE Schistosomiasis is still a major public health problem in China, despite the fact that the government has implemented a series of strategies to prevent and control the spread of the parasitic disease. Advanced warning and reliable forecasting can help policymakers to adjust and implement strategies more effectively, which will lead to the control and elimination of schisto...
Demand planning for electricity consumption is a key success factor for the development of any countries. However, this can only be achieved if the demand is forecasted accurately. In this research, different forecasting methods—autoregressive integrated moving average (ARIMA), artificial neural network (ANN) and multiple linear regression (MLR)—were utilized to formulate prediction models of t...
Two smoothing strategies combined with autoregressive integrated moving average (ARIMA) and autoregressive neural networks (ANNs) models to improve the forecasting of time series are presented. The strategy of forecasting is implemented using two stages. In the first stage the time series is smoothed using either, 3-point moving average smoothing, or singular value Decomposition of the Hankel m...
Previous research for short-term traffic prediction mostly forecasts only one time interval ahead. Such a methodology may not be adequate for response to emergency circumstances and road maintenance activities that last for a few hours or a longer period. In this study, various approaches, including naïve factor methods, exponential weighted moving average (EWMA), autoregressive integrated movi...
This work aims to treat the parameter estimation problem for fractional-integrated autoregressive moving average (F-ARIMA) processes under external noise. Unlike the conventional approaches from the perspective of the time domain, a maximum likelihood (ML) method is developed in the frequency domain since the power spectrum of an F-ARIMA process is in a very explicit and more simple form. Howev...
This manuscript deals with the similarity querying problems for cases where data loss exists. Limitations in traditional methodologies for querying incomplete data in database, data mining and information retrieval research has urged to shift into development of different new innovative models. This Investigation is done based on a model developed based on ARIMA constructional model to check th...
For the fractional ARIMA model, we demonstrate that wrong model speciication might lead to serious problems of inference in nite samples. We assess the performance of various model selection criteria when the true model is fractionally integrated and the alternatives of interest are ARMA and fractional ARIMA models. The likelihood of successful identiication increases substantially with rising ...
BACKGROUND The infection rate of syphilis in China has increased dramatically in recent decades, becoming a serious public health concern. Early prediction of syphilis is therefore of great importance for heath planning and management. METHODS In this paper, we analyzed surveillance time series data for primary, secondary, tertiary, congenital and latent syphilis in mainland China from 2005 t...
BACKGROUND Hepatitis is a serious public health problem with increasing cases and property damage in Heng County. It is necessary to develop a model to predict the hepatitis epidemic that could be useful for preventing this disease. METHODS The autoregressive integrated moving average (ARIMA) model and the generalized regression neural network (GRNN) model were used to fit the incidence data ...
شاخص سطح برگ یکی از پارامترهای مؤثر برای توصیف شار انرژی، تبادلات سطح زمینـ اتمسفر، ساختمان پوشش گیاهی و... است. در این تحقیق با استفاده از مدلسازی بر پایۀ روش باکسـ جنکینز سریهای زمانی شاخص سطح برگ یونجه، گندم، سیب و سیبزمینی بررسی شد و با نتایج روابط ریاضی بین شاخص سطح برگ و شاخص NDVI مقایسه شدند. روند سریهای زمانی بهدستآمده از سنجندۀ MODIS طی دورۀ زمانی 2012ـ 2015 با دورۀ تناوب 46 ...
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