VBIRX: how its history is extended
VBIRX returns from its first trading day; earlier history from BSV, then VBISX. (represented by the bond_short asset chain before its own history)
Kind
Backfill chain
Extended from
1994-03-01
Through
2026-10-09
Sources
VBIRX → BSV → VBISX
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| VBIRX | BSV | 2001-11-12 | 19.5 | 0.9308 | -0.017 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| BSV | VBISX | 2007-04-10 | 19.5 | 0.9311 | 0.085 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
Figures on this page are computed from the data store when the page renders; the gate is re-checked every time an extension is used. Method: the lab's tracking standard, lab.data.chains.