Fig. 1
From: Identification of a metabolomic signature associated with feed efficiency in beef cattle
PCA (a and c, in negative and positive mode, respectively) and PLS-DA (b and d, negative and positive mode, respectively) scores plots based on LC/MS data of serum samples from HFE (red) and LFE (green). The PLS-DA models discriminated between HFE and LFE groups (R2 of 0.87 and 0.98 in negative and positive mode, respectively) but were not predictive (Q2 of 0.08 and 0.15). Considering a common heuristic for metabolomics data: R2 > 0.8 and Q2 > 0.5, the model was not overfitted. Consistent with this, a permutation test (2000 permutations) yielded P-values > 0.9 in both modes