FIGURE 4.

Histograms of the bootstrap samples of ${\tilde{I}}_{\text{Rand}}$ i.e. for the random$d_0$ business-as-usual allocation procedure. The thick black line is the best estimate of ${\widehat{I}}_0$, the thin black lines are the confidence interval computed via the percentile method. More negative values are “better” as improvement is defined as lowering the HSRD composite score corresponding to a patient being less depressed.