Table 4 Univariable analysis results based on characteristic input variables
From: Quantitative analysis of cadmium in rice roots based on LIBS and chemometrics methods
Pretreatment methods | Wavelength (nm) | Model | Determination coefficient | Calibration set | Prediction set | ||
|---|---|---|---|---|---|---|---|
Rc | RMSEC (mg/kg) | Rp | RMSEP (mg/kg) | ||||
Raw | 214.44 | Logarithmic | 0.9101 | 0.8995 | 68.9 | 0.9140 | 64.7 |
Polynomial | 0.9222 | 0.9116 | 64.8 | 0.9248 | 60.7 | ||
226.50 | Logarithmic | 0.9044 | 0.8931 | 70.9 | 0.9081 | 66.9 | |
Polynomial | 0.9168 | 0.8996 | 68.8 | 0.9160 | 64.3 | ||
228.80 | Logarithmic | 0.6473 | 0.6336 | 122.0 | 0.6336 | 124.0 | |
Polynomial | 0.6833 | 0.6800 | 116.0 | 0.6290 | 124.0 | ||
214.44 + 226.50 | Linear | 0.9406 | 0.9329 | 56.7 | 0.9479 | 54.8 | |
226.50 + 228.80 | Linear | 0.9712 | 0.9738 | 35.8 | 0.9610 | 45.9 | |
214.44 + 228.80 | Linear | 0.9709 | 0.9734 | 36.0 | 0.9614 | 46.0 | |
214.44 + 226.50 + 228.80 | Linear | 0.9712 | 0.9738 | 35.8 | 0.9612 | 45.9 | |
After pretreatment | 214.44 | Logarithmic | 0.9805 | 0.9622 | 42.9 | 0.9566 | 46.7 |
Polynomial | 0.9922 | 0.9833 | 28.7 | 0.9821 | 31.1 | ||
226.50 | Logarithmic | 0.9834 | 0.9683 | 39.3 | 0.962 | 43.9 | |
Polynomial | 0.9924 | 0.9844 | 27.7 | 0.9818 | 31.4 | ||
228.80 | Logarithmic | 0.9759 | 0.9485 | 49.9 | 0.9521 | 50.8 | |
Polynomial | 0.9815 | 0.9563 | 46.1 | 0.9734 | 42.6 | ||
214.44 + 226.50 | Linear | 0.9922 | 0.9856 | 26.7 | 0.9796 | 33.2 | |
226.50 + 228.80 | Linear | 0.9926 | 0.9868 | 25.5 | 0.9793 | 32.4 | |
214.44 + 228.80 | Linear | 0.9922 | 0.9851 | 27.1 | 0.9779 | 33.1 | |
214.44 + 226.50 + 228.80 | Linear | 0.9929 | 0.9878 | 24.5 | 0.9793 | 32.6 | |