Table 3 Multiple linear regression results of the trace metal concentrations in the PM2.5 samples.
From: Trace metals and magnetic particles in PM2.5: Magnetic identification and its implications
Regression equation | Training | Test | |
|---|---|---|---|
R | p value | R | |
As = 265.5 − 1.166 PM2.5 | 0.463 | 0.010 | 0.191 |
Cd = 13.91 + 0.018 χLF | 0.429 | 0.018 | 0.809 |
Cr = 842.8 − 5.534 PM2.5 | 0.738 | 0.000 | 0.452 |
Cu = 892.9 − 4.034 PM2.5 | 0.570 | 0.001 | 0.149 |
Fe = 7461 + 0.119 SIRM | 0.705 | 0.000 | 0.814 |
Mn = 514.7 + 0.540 χLF | 0.554 | 0.002 | 0.533 |
Ni = 64.43 + 7.094 χARM/SIRM | 0.449 | 0.013 | 0.381 |
Pb = 908.5 + 0.021 SIRM − 0.670 χARM | 0.560 | 0.006 | 0.703 |
Sr = 426.1 − 2.117 PM2.5 | 0.419 | 0.021 | 0.666 |
Ti = 1445 − 6.937 PM2.5 | 0.480 | 0.007 | 0.273 |
V = 20.85 − 0.434 PM2.5 + 23.73 χARM/χLF | 0.614 | 0.002 | 0.343 |
Zn = 6327 − 27.23 PM2.5 | 0.520 | 0.003 | 0.164 |
