基于变精度的思想,提出了一种新的不完备信息系统变精度粗糙集模型。基于该模型给出了不完备信息系统的β上(下)分布约简和β上(下)近似约简。给出了求解不完备信息系统β上(下)分布约简的辨识矩阵方法。
A new variable--precision rough set model for incomplete information systems is established based on variable rough sets models β upper (lower) distribution reduction and β upper (lower) approximate reduction are introduced for incomplete information systems.The methods for discernibility matrixes for β upper(lower) distribution reduction are also presented.