نتایج جستجو برای: مدل اقتصادسنجی arima
تعداد نتایج: 123637 فیلتر نتایج به سال:
This paper examines the forecasting performance of ARIMA and artificial neural networks model with published stock data obtained from New York Stock Exchange. The empirical results obtained reveal the superiority of neural networks model over ARIMA model. The findings further resolve and clarify contradictory opinions reported in literature over the superiority of neural networks and ARIMA mode...
OBJECTIVE Emergency department (ED) overcrowding is acknowledged as an increasingly important issue worldwide. Hospital managers are increasingly paying attention to ED crowding in order to provide higher quality medical services to patients. One of the crucial elements for a good management strategy is demand forecasting. Our study sought to construct an adequate model and to forecast monthly ...
This paper presents a comprehensive study of ANFIS+ARIMA+IT2FLS models for forecasting the weather of Raipur, Chhattisgarh, India. For developing the models, ten year data (2000-2009) comprising daily average temperature (dry-wet), air pressure, and wind-speed etc. have been used. Adaptive Network Based Fuzzy Inference System (ANFIS) and Auto Regressive Moving Average (ARIMA) models based on In...
Forecasting accuracy is one of the most favorable critical issues in Autoregressive Integrated Moving Average (ARIMA) models. The study compares the application of two forecasting methods on the amount of Taiwan export, the Fuzzy time series method and ARIMA method. Model discussed for the ARIMA method and Fuzzy time series method include the Sturges rules. When the sample period is extend in o...
مدل سازی و مقایسه روش شبکه عصبی gmdh و الگوی سری زمانی arima در پیش بینی بلندمدت تقاضای برق در ایران
امروزه برق یکی از مهم ترین حامل های انرژی است و به عنوان صنعتی زیربنایی در فرآیند توسعه اقتصادی هر کشور نقش مهمی ایفا می کند. در کشور ما با توجه به نیازهای روز افزون کشور به این انرژی، مدیریت و برنامه ریزی مناسب در جهت تأمین آن از اهمیت بالایی برخوردار است. بکی از مباحثی که می تواند در این حوزه کاربرد فراوانی داشته باشد، پیش بینی میزان تقاضای برق در سطح کشور می باشد که تا حدی مسیر رشد مصرف را د...
BACKGROUND A prediction model for tuberculosis incidence is needed in China which may be used as a decision-supportive tool for planning health interventions and allocating health resources. METHODS The autoregressive integrated moving average (ARIMA) model was first constructed with the data of tuberculosis report rate in Hubei Province from Jan 2004 to Dec 2011.The data from Jan 2012 to Jun...
این مقاله به بررسی عملکرد پیش بینی مدل های arima و arfima با استفاده از داده های روزانه بازده شاخص کل سهام تهران در بازه زمانی 04/09/1380 تا 09/09/1390 می پردازد. در این راستا جهت تخمین پارامتر d و دیگر پارامترها، از روشnls در بسته نرم افزار oxmetric/pcgive استفاده شد و پس از مقایسه نتایج مدلهای تحقیق؛ مدل arfima بر اساس معیار aic مدلی برتر در مدل سازی tepix مشخص گردید. همچنین از میان براورد...
Natural calamities (e.g., hurricane, excessive ice-fall) may often impede the inventory replenishment during the peak sale season. Due to the extreme situations, sales may not occur and demand may not be recorded. This study focuses on forecasting of intermittent seasonal demand by taking random demand with a proportion of zero values in the peak sale season. Demand pattern for a regular time i...
In this study we develop the hybrid models for forecasting in agricultural production planning. Real data of Thailand’s orchid export and Thailand’s pork product are used to validate candidate models. Autoregressive Integrate Moving Average (ARIMA) is also selected as a benchmarking to compare other developed models. The main concept of building the models is to combine different forecasting te...
Auto Regressive Integrated Moving Average (ARIMA) is a broad class of time series models, and it has been achieved using the statistical differencing approach. It is normally being performed using the computational method. Thus, it is useful to choose the suitable model from a possibly large selection of the available ARIMA formulations. The ARIMA approach was then analysed with the presence of...
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