Variation-Oriented Data Filtering for Improvement in Model Complexity of Air Pollutant Prediction Model

Table 1

Pearson correlation coefficients between the output variables SO₂(𝑑+1) and input variables candidates on pervious days in the time period from year 2003 to year 2008.

Relation to SO2(𝑑+1)	Day
Input variables	𝑑	𝑑−1	𝑑−2	𝑑−3	𝑑−4
SPM	0.50	0.40	0.37	0.35	0.36
SO2	0.72	0.57	0.50	0.45	0.44
NO2	0.64	0.52	0.48	0.44	0.43
O3	−0.05	−0.03	−0.03	−0.01	0.00
AP	0.57	0.56	0.54	0.52	0.49
TEMP	−0.60	−0.59	−0.55	−0.52	−0.48
mRH	−0.36	−0.31	−0.27	−0.23	−0.21
WS	0.21	0.27	0.26	0.22	0.20
RF	−0.15	−0.14	−0.14	−0.14	−0.14
SHr	−0.08	−0.08	−0.07	−0.08	−0.07