Figure 2
Classification variance. Variance and 95% confidence intervals of the AUC from external validation between the five datasets (n = 2 × 
= 20 (train, test) pairs) for different numbers of features. The confidence intervals are 
, where 
is the α = 0.05 quantile for a chi-squared distribution with n - 1 degrees of freedom, s2 is the sample variance and.