Figure 4
(a) Out-of-bag permuted predictor importance of the 24 optical properties values when taken as prediction parameters for the response β1 in a RF approach. (b) Graphical representation of data sets for \(\mu^{\prime}_{s}\) of stratum corneum (dots) and the exponential function fitted thereto (curve). The equation is as follows: \(y = 0.5979 \cdot \exp ( - 0.3524 \cdot \mu^{\prime}_{{s_{sc} }} ) + 0.02854\)
