The Composite Operator of Graded-Variable Precision Rough Sets and Its Properties

In order to expand the application of rough set operator, we analyzed two kinds of operator and the relationship between conversion structure based on the degree of rough set operator and variable precision rough set operator. By introducing a parameter α, we give a Graded-Variable precision rough set model. And we get the Upper approximation operator and Lower approximation operator and some of its properties. This model is feasible and effectiveness for dealing with fuzzy and uncertain knowledge in the information system. Experiments show that the model adds the concept of information understanding. It improved the accuracy of approximation classification and concept of accuracy in the wrong classification of the same degree.