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

Table 7

Performance of different methods for 50% missing values.

Method		Mean	STD	value
SM	RMSE	23.09	0.34	2.26e − 14
	^2	0.8899	0.0034	1.88e − 15
NN	RMSE	24.31	0.62	5.36e − 14
	^2	0.8814	0.0060	3.70e − 14
GNNM	RMSE	21.43	0.26	9.53e − 08
	^2	0.9127	0.0027	2.65e − 09
LNNM	RMSE	19.01	0.45	—
	^2	0.9295	0.0033	—