Chronological Age Estimation of Male Occipital Bone Based on FTIR and Raman Microspectroscopy

Figure 4

PLS and GA-PLS regression models of FTIR and Raman age estimation. The dark color dots represent the calibration datasets, and the light color dots represent the prediction datasets. The dark color line is the target line corresponding to the perfect prediction, while the light color line is the model fitting line. (a) FTIR PLS regression model. (b) FTIR PLS regression model VIP scores plot. (c) FTIR GA-PLS regression model. (d) FTIR variables selected by GA (blue shades). (e) Raman PLS regression model. (f) Raman PLS regression model VIP scores plot. (g) Raman GA-PLS regression model. (h) Raman variables selected by GA (orange shades).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)