Topological Models of Rough Sets and Decision Making of COVID-19

Table 3

The boundary and accuracy of approximations for Yao Method 2.9 [26] and current method in Definition 4.2.

	Yao Method				Method in Definition 16
									1
								1
				Not defined				1
				Not defined				0
				1				1
								1
								2/3
								1
				Not defined				1
				1				3/4
				1				1
								1
								1
				1				1