نتایج جستجو برای: fuzzy time series

تعداد نتایج: 2203401  

Journal: :Journal of Computing Research and Innovation 2021

There are a variety of approaches to the problem predicting educational enrolment. However, none them can be used when historical data linguistic values. Fuzzy time series is an efficient and effective tool deal with such problems. In this paper, forecast enrolment pre-primary, primary, secondary, tertiary schools in Malaysia carried out using fuzzy approaches. A model developed dataset collect...

Journal: :Fuzzy Sets and Systems 2015
Michal Holcapek Irina Perfilieva Vilém Novák Vladik Kreinovich

The fundamental concept in the theory of fuzzy transform (F-transform) is that of fuzzy partition. The original definition assumes that each two fuzzy subsets overlap in such a way that sum of membership degrees in each point is equal to 1. However, this condition can be generalized to obtain a denser fuzzy partition that leads to improvement of approximation properties of Ftransform. However, ...

Proper models for prediction of time series data can be an advantage in making important decisions. In this study, we tried with the comparison between one of the most useful classic models of economic evaluation, auto-regressive integrated moving average model and one of the most useful artificial intelligence models, adaptive neuro-fuzzy inference system (ANFIS), investigate modeling procedur...

2009
Yi-Chung Cheng Chih-Chuan Chen Pei-Chih Chen Sheng-Tun Li

With the capability of dealing with vague and incomplete data, the study of fuzzy time series has attracted great interest and is expected to expand rapidly. Song and Chissom (1993) first proposed the seven-step forecasting framework of fuzzy time series which are composed of (1) definition of the universe of discourse, (2) partitioning of the universe of discourse, (3) definition of fuzzy sets...

2013
Lazim Abdullah

Fuzzy time series model has been employed by many researchers in forecasting activities such as students’ enrolment, temperature fluctuations and stock prices. The existing fuzzy time series models require exact match of the fuzzy logic relationships to calculate the forecasted value. However, in real life applications, the exact match of fuzzy logic relationships is not possible. Thus, an impr...

2007
Tahseen Ahmed Jilani Cemal Ardil

In the last 15 years, a number of methods have been proposed for forecasting based on fuzzy time series. Most of the fuzzy time series methods are presented for forecasting of enrollments at the University of Alabama. However, the forecasting accuracy rates of the existing methods are not good enough. In this paper, we compared our proposed new method of fuzzy time series forecasting with exist...

2014
Nadejda Yarushkina Tatiana Afanasieva Irina Timina

The article is devoted to the problem of applying the formal data mining tool – forecasting – for the developing of new software and for reengineering the present software. We propose the algorithm adjustments of the time series forecasting. This algorithm takes into account the dependence of the current state of time series from the previous one, the influence of basic fuzzy projected trends i...

2011
MEMMEDAGA MEMMEDLI OZER OZDEMIR

Fuzzy approach and artificial neural networks become effective tool for researchers by forecasting fuzzy time series. The relation of these has advantage to improve forecasting performance especially in handling nonlinear systems. Hence, in this study we aimed to handle a nonlinear problem to apply neural network-based fuzzy time series model. Differing from previous studies, we used various de...

2007
Paulo Salgado Getúlio Igrejas Fernando Gouveia

This paper presents a fuzzy system approach to the prediction of nonlinear time series and dynamical systems based on a fuzzy model that includes its derivative information. The underlying mechanism governing the time series, expressed as a set of IF–THEN rules, is discovered by a modified structure of fuzzy system in order to capture the temporal series and its temporal derivative information....

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