Extended Tolerance Relation to Define a New Rough Set Model in Incomplete Information Systems

Table 1

An example of dataset with missing values.

Cases	Temperature	Headache	Nausea	Decision (flu)
𝑥1	High	*	No	Yes
𝑥2	Very high	Yes	Yes	Yes
𝑥3	*	No	No	No
𝑥4	High	Yes	Yes	Yes
𝑥5	High	*	Yes	No
𝑥6	Normal	Yes	No	No
𝑥7	Normal	No	Yes	No
𝑥8	*	Yes	*	Yes