FIGURE 2.

Histograms of the bootstrap samples of the out-of-sample improvement measures for $d_0$ random (left column) and $d_0$ best (right column) for the response model of Eq. 11 for different values of n. ${\widehat{I}}_0$ is illustrated with a thick black line. The ${\text{CI}}_{{\mu }_{I_0},95\%}$ computed by the percentile method is illustrated by thin black lines.