SGOV: how its history is extended
SGOV returns from its first trading day; earlier history from BIL, then TBILL.IRX, then TBILL.TB3MS. (represented by the tbill asset chain before its own history)
Kind
Backfill chain
Extended from
1934-02-28
Through
2026-10-09
Sources
SGOV → BIL → TBILL.IRX → TBILL.TB3MS
Validation at each junction
| Real series | Stands in before it | Real data from | Overlap (years) | Monthly correlation | Return gap (pp/yr) | Gate |
|---|---|---|---|---|---|---|
| SGOV | BIL | 2020-06-01 | 6.35 | 0.9968 | 0.122 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| BIL | TBILL.IRX | 2007-05-30 | 19.36 | 0.9462 | -0.09 | pass (bars: corr ≥ 0.9, |gap| ≤ 1.0pp) |
| TBILL.IRX | TBILL.TB3MS | 1960-01-04 | 66.58 | 0.9935 | 0.002 | 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.