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

Table 6

Performance of different methods for 40% missing values.

Method		Mean	STD	value
SM	RMSE	22.88	0.45	5.13e − 15
	^2	0.8918	0.0041	1.28e − 15
NN	RMSE	22.87	0.61	7.68e − 14
	^2	0.8948	0.0055	1.01e − 13
GNNM	RMSE	20.59	0.26	4.12e − 12
	^2	0.9185	0.0029	1.21e − 10
LNNM	RMSE	17.57	0.50	—
	^2	0.9388	0.0037	—