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	Gråklustring: Vitaliserings-baserad klassificering under osäkerhet	GM(1,1) Grå Prognosmodell
Ämnesområde	Soft computing	Soft computing
Familj	Machine learning	Regression model
Ursprungsår	2010	1982
Upphovsperson	Julong Deng; Sifeng Liu	Julong Deng
Typ	Whitenization-based soft clustering	Small-sample grey forecasting model
Ursprungskälla	Liu, S., & Lin, Y. (2010). Grey Systems: Theory and Applications. Springer. ISBN: 978-3-642-13937-6	Deng, J. L. (1982). Control problems of grey systems. Systems & Control Letters, 1(5), 288–294.
Alias	Grey Whitenization Weight Function Clustering, Grey Fixed-Weight Clustering, Grey Variable-Weight Clustering, Gri Kümeleme	GM(1,1), grey prediction model, grey forecasting, gri tahmin modeli
Närliggande	2	2
Sammanfattning	Grey Clustering is a classification method from grey systems theory that assigns objects to predefined grey classes using whitenization weight functions. Developed within the framework of Deng Julong's grey system theory and systematized by Sifeng Liu, it is particularly suited for situations involving small sample sizes, incomplete information, or uncertain data—conditions common in engineering assessments, environmental monitoring, and socioeconomic evaluation. The method quantifies how strongly each object belongs to each grey class and makes a crisp assignment based on maximum clustering coefficients.	GM(1,1) is the core forecasting model of grey system theory, introduced by Julong Deng in 1982, designed to predict from very few observations and incomplete information — situations where classical time-series models like ARIMA need far more data. It accumulates the raw series to expose a hidden exponential trend, fits a first-order grey differential equation, and projects future values, making it popular in engineering, energy, and management forecasting with short data records.