estimate

The reported confidence interval for the selected best system's objective. With deltaC > 0 this is the indifference-zone interval ḡ(x_B) ± δ_C (the correct-selection precision target). With deltaC == 0 it is an ordinary two-sided Student-t confidence interval on the mean at level oneMinusAlphaC.

Best-effort when the Rinott cap binds (D4). The ± δ_C interval is the target precision; when select has to clamp a survivor's second-stage size at maxReplicationsPerSystem (logged as a warning), the precision actually achieved is coarser than δ_C, so a reported ± δ_C is optimistic. Raise maxReplicationsPerSystem or δ_C to restore the exact interval.