Table 5.
Linear Regression Statistics from Extreme Gradient Boost Model That Includes All 576 Prediction and Cross-Validation Data Points for Total Cannabidiol and Total Tetrahydrocannabinol Measured by Gas Chromatography-Flame Ionization
| Technique | Parameter | Intercept | SE | Slope | LOD % (w/w) | LOQ % (w/w) | Adjusted R2 | n |
|---|---|---|---|---|---|---|---|---|
| A-TEEM | CBD+CBDA | 0.019 | 0.006 | 1 | 0.019 | 0.059 | 0.9954 | 576 |
| THC+THCA | −0.016 | 0.006 | 1 | 0.020 | 0.061 | 0.9958 | 576 | |
| GC-FID | CBD+CBDA | −2.872×10−5 | NA | 5.424×10−4 | 0.01 | 0.025 | 1 | NA |
| THC+THCA | −2.877×10−6 | NA | 5.546×10−4 | 0.01 | 0.025 | 1 | NA |
The slope for A-TEEM data 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 combines calibration and validation.
A-TEEM, absorbance-transmittance excitation emission matrix; CBDA, cannbidiolic acid; GC, gas chromatography; LOD, limit of detection; LOQ, limit of quantification; NA, not applicable; SE, standard error; THCA, tetrahydrocannabinolic acid.