Fig. 2.

Bootstrap (B = 400) stepwise variable selection procedure for the clinical and radiomics data. The green bars show the percentage of time a variable was selected. The blue and red triangles (Coef Sign) show a represented rate of times the variable’s coefficient was positive or negative in each bootstrap run, respectively. The horizontal line shows the cut-off point for selected variables. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)