TLT: how its history is extended
TLT returns from its first trading day; earlier history from VGLT, then VUSTX, then DGS20.CM. (represented by the treas_long asset chain before its own history)
Kind
Backfill chain
Extended from
1962-01-04
Through
2026-10-09
Sources
TLT → VGLT → VUSTX → DGS20.CM
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| TLT | VGLT | 2002-07-30 | 16.76 | 0.9967 | -0.163 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| VGLT | VUSTX | 2010-01-04 | 16.76 | 0.9987 | 0.092 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| VUSTX | DGS20.CM | 1986-05-19 | 40.39 | 0.9825 | -0.229 | 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.