Generalized grey relational grade and grey relational order test

Based on the concept of generalized grey relational grade (GRG), upper-limit whitened grey relational grade and the lower-limit whitened grey relational grade and the corresponded upper and lower limit whitened grey relational order proposed by us, the comprehensive test method of grey relational order (GRO) is initially built. Significance of general grey relational grade and grey relational order test is briefly discussed. A useful example in this paper is to analyze the grey relation between left ventricular filling fraction (LVFF) and ambulatory blood pressure (ABP) in a group of patients with essential systolic hypertension. The conclusion is in accordance with the previous reports that grey relation between left ventricular filling dysfunction (LVFD) and 24 hours ambulatory systolic blood pressure (ASBP_24h) in essential systolic hypertensive is the strongest.