VSIAX: how its history is extended
VSIAX returns from its first trading day; earlier history from VBR, then VISVX. (represented by the us_small_value asset chain before its own history)
Kind
Backfill chain
Extended from
1998-05-22
Through
2026-09-11
Sources
VSIAX → VBR → VISVX
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| VSIAX | VBR | 2011-09-27 | 14.88 | 0.9999 | -0.015 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| VBR | VISVX | 2004-01-30 | 22.54 | 0.9991 | 0.149 | 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.