Cost-Sensitive Feature Selection of Numeric Data with Measurement Errors

Table 7

Approximations of object subsets on different test sets.

	𝑋	{𝑎1}	{𝑎1,𝑎2}	{𝑎1,𝑎3}	{𝑎1,𝑎2,𝑎3}
𝑁𝐵(𝑋)	𝑋1	{𝑥2}	{𝑥1,𝑥2}	{𝑥1,𝑥2,𝑥3}	{𝑥1,𝑥2,𝑥3}
	𝑋2	{𝑥4}	{𝑥4,𝑥5}	{𝑥4,𝑥5,𝑥6}	{𝑥4,𝑥5,𝑥6}
𝑁𝐵(𝑋)	𝑋1	{𝑥1,𝑥2,𝑥3,𝑥5,𝑥6}	{𝑥1,𝑥2,𝑥3,𝑥6}	{𝑥1,𝑥2,𝑥3}	{𝑥1,𝑥2,𝑥3}
	𝑋2	{𝑥1,𝑥3,𝑥4,𝑥5,𝑥6}	{𝑥3,𝑥4,𝑥5,𝑥6}	{𝑥4,𝑥5,𝑥6}	{𝑥4,𝑥5,𝑥6}