VIS: how its history is extended
VIS returns from its first trading day; earlier history from XLI.
Kind
Backfill chain
Extended from
1998-12-23
Through
2026-08-18
Sources
VIS → XLI
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| VIS | XLI | 2004-09-29 | 21.88 | 0.9942 | 0.013 | 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.