نتایج جستجو برای: مدل arima

تعداد نتایج: 122901  

2014
Lingling Zhou Lijing Yu Ying Wang Zhouqin Lu Lihong Tian Li Tan Yun Shi Shaofa Nie Li Liu

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...

2011
Karin Kandananond

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...

2014
Lida Barba Nibaldo Rodríguez Cecilia Montt

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...

2006
Ming Zhong Satish Sharma Pawan Lingras

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...

Journal: :IEEE Trans. Signal Processing 2002
Bor-Sen Chen Bore-Kuen Lee Sen-Chueh Peng

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...

2015
Kalbhor Swati Gupta Shyam

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...

1995
Christoph M. Schmidt Rolf Tschernig Rainer Dahlhaus Manfred Deistler Uwe Hassler Ian McLeod Pierre Perron Volker Sommer

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 ...

2016
Xingyu Zhang Tao Zhang Jiao Pei Yuanyuan Liu Xiaosong Li Pau Medrano-Gracia Jeffrey Shaman

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...

2016
Wudi Wei Junjun Jiang Hao Liang Lian Gao Bingyu Liang Jiegang Huang Ning Zang Yanyan Liao Jun Yu Jingzhen Lai Fengxiang Qin Jinming Su Li Ye Hui Chen

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 ...

ژورنال: اکو هیدرولوژی 2017

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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