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

Table 9

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

	Good	Commonly	Qualified	Unqualified	Difference
Good	1.12	1.32	1.21	0.61	−0.32
Commonly	−0.004	1.005	0.82	2.44	0.82
Qualified	1.21	1.24	0.79	−0.31	1.36
Unqualified	1.72	0.82	0.802	0.82	1.84
Difference	0.26	1.32	1.34	0.87	0.60