Fig. 1.

Determining the characteristics of robust RF models. (A) Variable importance score versus ranking in weak RF models comparing Arabidopsis ammonia transporter mutant lines and brassinosteroid synthesis antisense lines to progenitor ecotypes. (B) Ordered list of top ranking signals from data depicted in A; correlated variables (e.g., isotopes) are color-coded and variables shared between models in the same metaclass are boxed. Variable importance score versus ranking in stronger RF models comparing pair wise with progenitor genotypes in potato transgenic lines (C) and Arabidopsis mutants (E). (D and F) Top ranking signals (descending order) from a selection of models depicted in A and E; m/z representing correlated variables (e.g., isotopes, salt adducts, and common fragments) are shaded in both lists.