Positive Macroscopic Approximation for Fast Attribute Reduction

Table 1

An incomplete decision system.

Car	Price	Mileage	Size	Max speed	Acceleration
𝑢1	High	High	Full	Low	Good
𝑢2	*	*	Full	Low	Good
𝑢3	*	*	Compact	Low	Poor
𝑢4	Low	*	Full	High	Good
𝑢5	*	*	Full	High	Excellent
𝑢6	High	High	Full	*	Good