Figure 2.

Relative importance weights for the 20 AUs used by the Random Forest model to generate ratings of positive and negative affect intensity. Relative importance is computed based on the change in standard deviation attributable to each given AU while integrating over all other AUs, which indicates the AUs that are most predictive of changes in positive/negative affect intensity. Images representing the five most important AUs are superimposed on each subplot. Image adapted with permission from Haines et al. (2019).