A Novel Method for Air Quality Data Imputation by Nuclear Norm Minimization

Table 4

Performance of different methods for 20% missing values.

Method		Mean	STD	value
SM	RMSE	22.82	0.52	1.14e − 14
	^2	0.8921	0.0045	7.05e − 16
NN	RMSE	21.42	0.77	7.39e − 12
	^2	0.9071	0.0058	1.38e − 12
GNNM	RMSE	19.57	0.60	7.99e − 10
	^2	0.9249	0.0045	1.06e − 09
LNNM	RMSE	15.73	0.78	—
	^2	0.9501	0.0048	—