Table 7.
Linear Regression Statistics from Extreme Gradient Boost Regression Model That Includes All 576 Prediction and Cross-Validation Data Points for Total Cannabidiol and Tetrahydrocannabinol Measured by HPLC
| Technique | Parameter | Intercept | SE | Slope | LOD % (w/w) | LOQ % (w/w) | Adjusted R2 | n |
|---|---|---|---|---|---|---|---|---|
| A-TEEM | CBD+CBDA | 0.001 | 0.007 | 1 | 0.024 | 0.080 | 0.9936 | 576 |
| THC+THCA | −0.006 | 0.002 | 1 | 0.008 | 0.026 | 0.9993 | 576 | |
| HPLC | CBD | −1.215×10−4 | NA | 0.022 | 0.037 | 0.110 | 0.9998 | NA |
| CBDA | 0.009 | NA | 0.025 | 0.010 | 0.029 | 0.9999 | NA | |
| THC | −0.001 | NA | 0.022 | 0.014 | 0.041 | 0.9997 | NA | |
| THCA | −0.006 | NA | 0.025 | 0.007 | 0.020 | 0.9996 | NA |
The A-TEEM slope was constrained to unity. Defined are the y-intercept (intercept), SE of the y-intercept (SE), LOD=3.3×SE, LOQ=3.3×LOD, the adjusted R2, and number of files (n) that combine calibration and validation.
HPLC, High-Performance Liquid Chromatography; NA, not applicable.