TY - JOUR AB - Purpose– The purpose of this paper is to overcome the deficiency of the current GM(1,N) such as low‐prediction precision, extend the scope of GM(1,N) and provide an effective grey dynamic model GM(1,N) for the relationship of cost and variability.Design/methodology/approach– The relationship between two factors of variety and the cost of manufacturing system is studied on the basis of the variety reduction program theory. Based on the Grey system and the gradient algorithm, a Grey dynamic model GM(1,N) is proposed between cost and variety by optimizing the coefficient and background value of the model which is used to check validity for the relation of plasm‐yarn machine product and variety.Findings– The proposed Grey dynamic prediction model GM(1,N) for the relationship of cost and variability has high precision and easy‐to‐use.Research limitations/implications– A Grey model GM(1,N) for prediction is proposed.Practical implications– The proposed model should also have potential for multifactor system prediction in engineering.Originality/value– The deficiency of the current GM(1,N) is overcome, the scope of GM(1,N) is extended and the proposed Grey dynamic model GM(1,N) has high‐prediction precision. VL - 38 IS - 3/4 SN - 0368-492X DO - 10.1108/03684920910944137 UR - https://doi.org/10.1108/03684920910944137 AU - Youxin Luo AU - Xiao Wu AU - Min Li AU - Anhui Cai ED - Mian‐yun Chen ED - Yi Lin ED - Hejing Xiong PY - 2009 Y1 - 2009/01/01 TI - Grey dynamic model GM(1,N) for the relationship of cost and variability T2 - Kybernetes PB - Emerald Group Publishing Limited SP - 435 EP - 440 Y2 - 2024/05/09 ER -