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

Table 3

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

	Good	Commonly	Qualified	Unqualified	Difference
Good	0.075	0	0.27	0	1.83
Commonly	−0.54	−0.005	1.34	0.34	−0.82
Qualified	1.32	1.21	0.001	2.44	0.82
Unqualified	−0.23	−0.004	−0.67	0.08	−0.31
Difference	1.34	0.60	−0.42	0.26	−0.01