Prediction of PM_2.5 in an Urban Area of Northern Thailand Using Multivariate Linear Regression Model

Table 2

Summary of R² and error measure for fitting results.

Annual
	R^2		RMSE		SE		Mean
	Model 1	Model 2	Model 1	Model 2	Model 1	Model 2	Model 1	Model 2
Chiang Mai	0.28	0.52	31.1	61.91	27.33	22.36	19.07	82.38
Lampang	0.02	0.60	35.11	66.48	30.27	19.37	12.69	84.48
Nan	0.36	0.39	25.22	40.23	21.72	21.05	17.36	51.89
Mean	0.22	0.50	30.48	56.21	26.44	20.93	16.37	72.92
Wet Season
Chiang Mai	0.09	0.18	11.43	42.1	6.93	6.56	10.42	51.99
Lampang	0.02	0.18	11.2	47.37	7.39	6.77	12.78	51.34
Nan	0.22	0.26	10.46	31.47	7.27	7.08	8.49	35.28
Mean	0.11	0.21	11.03	40.31	7.20	6.80	10.56	46.20
Dry Season
Chiang Mai	0.17	0.4	42.58	76.91	39.19	34.07	35.94	135.62
Lampang	0.03	0.32	57.67	90.44	30.85	25.81	14.93	140.15
Nan	0.06	0.13	38.82	55.06	27.9	26.96	36.74	88.95
Mean	0.09	0.28	46.36	74.14	32.65	28.95	29.20	121.58