Abstract: Variable precision rough set was improved in this paper.Combined with tolerance relation theory,the weighted variable precision model based on tolerance theory was proposed.Furthermore,we suggested a new heuristic algorithm using the sensitivity of attributes,which is based on the significance of attributes and entropy, can overcome the shortcoming of classical model and ensure the completeness of reduction.As a result,traditional Chinese prescriptions were used to prove the effectiveness of model and algorithm mentioned in this paper.

Key words: Variable precision rough sets,Big data analysis,Tolerance theory,Attribute reduction,Chinese prescription