Figure 3.

Feature selection for LASSO of the delta-radiomics features. (a) Tuning parameter (λ) selection by 5-fold cross-validation with minimum criteria. Binomial deviance (y-axis) was plotted against log(λ) (x-axis). The left dotted vertical line was at the optimal lambda value point by using the minimum criteria, and the right line was at the optimal lambda value point by using one standard error of the minimum criteria (the 1-SE criteria). The optimal value of λ was 0.054 (minimum), and the corresponding value of log(λ) = −2.919. (b) The least absolute shrinkage and selection operator coefficient profiles of the 80 radiomic features after univariate analysis. For the optimal λ, nine features with non-zero coefficients were selected.