VSGAX: how its history is extended
VSGAX returns from its first trading day; earlier history from VBK, then VISGX. (represented by the us_small_growth asset chain before its own history)
Kind
Backfill chain
Extended from
1998-05-22
Through
2026-09-11
Sources
VSGAX → VBK → VISGX
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| VSGAX | VBK | 2011-09-27 | 14.96 | 0.9995 | -0.016 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| VBK | VISGX | 2004-01-30 | 22.61 | 0.9991 | 0.126 | 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.