What do the ANOVA bars mean?
ANOVA (Analysis of Variance) is a linear, regression based sensitivity measure.
The ANOVA bars indicates which variables are important for the computation of the response. The length of the blue bar is the ANOVA value, whereas the red bar is the 95% confidence interval. If the red bar is too large, then you cannot trust the value computed, and you may be better of believing that that variable does not contribute to the response. Conversely, if the confidence interval is small, then the contribution of that variable is significant.
