IWF: how its history is extended
IWF returns from its first trading day; earlier history from VUG, then VIGRX. (represented by the us_large_growth asset chain before its own history)
Kind
Backfill chain
Extended from
1992-11-02
Through
2026-09-14
Sources
IWF → VUG → VIGRX
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| IWF | VUG | 2000-05-26 | 22.62 | 0.9941 | -0.151 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| VUG | VIGRX | 2004-01-30 | 22.61 | 0.9983 | 0.142 | 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.