[Retracted] An Empirical Analysis of Piano Performance Skill Evaluation Based on Big Data

Table 2

Error of the first test result matrix and the actual situation.

	Good	Commonly	Qualified	Unqualified	Difference
Good	0.024	1.24	1.39	0.68	0.68
Commonly	−1.32	0.03	−0.32	1.13	1.32
Qualified	1.83	−0.82	0.04	−1.31	−0.21
Unqualified	−0.82	−0.21	0.82	0.04	−0.04
Difference	0.32	−0.04	−0.32	0.82	−0.02