نتایج جستجو برای: nonlinear time series

تعداد نتایج: 2292721  

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه پیام نور - دانشگاه پیام نور استان تهران - دانشکده علوم 1392

در نظر گرفتن یک فرض کلاسیک در ساختمان سری ها موجب شده است، مشاهدات را با یک الگوی خطی که ضرایبش با زمان تغییر نمی کند در نظر گیرند. اما بسیاری از سری های زمانی دارای میانگین و واریانس ثابتی در طول زمان نیستند در این شرایط مدل های اتورگرسیو مشروط به ناهمسانی واریانس اغلب به نتایج مطلوبی منجر می شوند. تحقیقات نشان داده اند مدل های شبکه عصبی برای نمایش رفتار غیرخطی داده ها نیز از عملکرد قابل توجهی...

Journal: :iranian economic review 0

modeling and analysis of future prices has been hot topic for economic analysts in recent years. traditionally, the complex movements in the prices are usually taken as random or stochastic process. however, they may be produced by a deterministic nonlinear process. accuracy and efficiency of economic models in the short period forecasting is strategic and crucial for business world. nonlinear ...

Journal: Iranian Economic Review 2007

Modeling and analysis of future prices has been hot topic for economic analysts in recent years. Traditionally, the complex movements in the prices are usually taken as random or stochastic process. However, they may be produced by a deterministic nonlinear process. Accuracy and efficiency of economic models in the short period forecasting is strategic and crucial for business world. Nonlinear ...

Journal: :Mathematical Problems in Engineering 2014

Journal: :the modares journal of electrical engineering 2010
hassan shanechi eman pourfar

in this paper, optimum location of power system stabilizers in order to damp inter-area oscillations has been investigated by using modal series method. nonlinear effects grow in dynamical behaviors of heavily loaded stressed power systems significantly. hence linear based methods and techniques no longer present clear and exact response of the systems. in this article by defining new nonlinear...

Journal: :Chaos: An Interdisciplinary Journal of Nonlinear Science 2015

2003
Holger Kantz

This book represents a modern approach to time series analysis which is based on the theory of dynamical systems. It starts from a sound outline of the underlying theory to arrive at very practical issues, which are illustrated using a large number of empirical data sets taken from various fields. This book will hence be highly useful for scientists and engineers from all disciplines who study ...

Journal: :مهندسی صنایع 0
مهدی خاشعی مهندسی صنایع مهدی بیجاری مهندسی صنایع غلامعلی رئیسی اردلی مهندسی صنایع

time series forecasting is an active research area that has drawn considerable attention for applications in a variety of areas. forecasting accuracy is one of the most important features of forecasting models. nowadays, despite the numerous time series forecasting models which have been proposed in several past decades, it is widely recognized that financial markets are extremely difficult to ...

Time series and their methods of analysis are important subjects in statistics. Most of time series have a linear behavior and can be modelled by linear ARIMA models. However, some of realized time series have a nonlinear behavior and for modelling them one needs nonlinear models. For this, many good parametric nonlinear models such as bilinear model, exponential autoregressive model, threshold...

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