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

Table 5

Performance of different methods for 30% missing values.

Method		Mean	STD	value
SM	RMSE	22.92	0.43	8.79e − 16
	^2	0.8914	0.0036	4.25e − 17
NN	RMSE	21.98	0.79	2.47e − 12
	^2	0.9025	0.0064	1.26e − 12
GNNM	RMSE	20.08	0.32	5.29e − 12
	^2	0.9217	0.0026	8.80e − 12
LNNM	RMSE	16.52	0.60	—
	^2	0.9454	0.0038	—