Fig. 5
Left plot Interval PLS (iPLS) plot calculated on 108 intervals (full CV) predicting fibre intake (g/day) (3-day WFR) from 12 averaged 1H NMR urine spectra. The RMSECV of the global model calculated with 3 LV’s is indicated by the dashed red horizontal line. The red-coloured intervals 3.96–4.02 and 7.57–7.70 ppm fall below the global RMSECV and have the smallest prediction errors. Right plot The predicted versus measured plot shows a RMSECV of 1.67 g/day and a correlation coefficient of 0.86. The dots are coloured according to the dietary fibre intake (light blue shows the lowest intake and pink shows the highest intake). The solid line is reference for full agreement, whereas the dotted line is the best-fitting linear regression line