A new intuitionistic fuzzy functions approach based on hesitation margin for time-series prediction

  • Ozge Cagcag YolcuEmail author
  • Eren Bas
  • Erol Egrioglu
  • Ufuk Yolcu


There are various studies in which a variety of prediction tools have been introduced in time-series prediction literature. Non-probabilistic approaches which are based on fuzzy set theory, especially in recent years, have been put forward. Although these approaches including adaptive network fuzzy inference system, fuzzy functions approach, and fuzzy regression can be successfully utilized as a prediction tool, they have not been designed for prediction problem and they pass over the dependency structure of time-series observations. From this point forth, designing a prediction tool that considers the dependency structure of the observations of time series will procure to get predictions more accurately. Although the membership values, in the analysis process, are taken into account in almost all fuzzy methods, the non-membership and hesitation values are not considered. However, using as much information as possible on time series may be another positive factor that gives more accurate predictions. The primary aim of this study, for time-series prediction, is to introduce an intuitionistic fuzzy regression functions approach based on hesitation margin (I-FRF-HM). In the introduced intuitionistic fuzzy regression functions approach, two inference systems are separately constituted such that while one of them uses membership, other one uses non-membership values as inputs of inference system in addition with the crisp observations of time series. Predictions obtained from each system are converted into final predictions of whole inference system via an approach based on hesitation margin. Intuitionistic fuzzy C-means are utilized to get membership and non-membership values in the proposed model. The proposed I-FRF-HM has been applied to various real-world time series. The obtained findings are evaluated along with the results of some other time-series prediction models. The results show that the proposed I-FRF-HM has superior prediction performance to other prediction models.


Time-series prediction Fuzzy regression functions Intuitionistic fuzzy C-means Hesitation margin 



This study is carried out by using facilities of Giresun University Forecast Research Laboratory

Compliance with ethical standards

Conflict of interest

The authors declare that there is no conflict of interests regarding the publication of this work.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.


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Authors and Affiliations

  1. 1.Forecast Research Laboratory, Faculty of EngineeringGiresun UniversityGiresunTurkey
  2. 2.Forecast Research Laboratory, Faculty of Arts and SciencesGiresun UniversityGiresunTurkey
  3. 3.Forecast Research Laboratory, Faculty of Economics and Administrative SciencesGiresun UniversityGiresunTurkey

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