Data audit
| file | SHA-256 | rows (excl. header) | cols | range | missing | dup dates |
|---|---|---|---|---|---|---|
| GDPC1.csv | 1c6c6e9f59e383e20c849dd299175c7a307526c09abdc18f18da9754fc5b3343 (matches README/bundle) | 319 | 2 (observation_date, GDPC1 float) | 1947-01-01 – 2026-07-01, quarterly, no gaps | 0 | 0 |
| UNRATE.csv | 621ff6fadf50910cb7a21ee20ba610c247cb043b29b4e05c4c1a72fadca2a06c (matches) | 945 | 2 (observation_date, UNRATE float) | 1948-01-01 – 2026-09-01, monthly, no date gaps | 1 (2025-10, empty value) | 0 |
Units: GDPC1 bn chained 2017 USD SAAR (min 2172.4, max 24611.1); UNRATE percent SA (min 2.5, max 14.8). No implausible values. Anomalies: UNRATE 2025-10 missing (outside the estimation window; that quarter is set to NaN, never used). GDPC1 is a current vintage (revised data, not real-time). Information availability: both files extend past 2019Q4; post-2019Q4 quarters are dropped (exclusions.csv step 2) before any estimation. 1959Q4 levels used only to form 1960Q1 differences, as the task prescribes. Exclusion ledger unit: quarters of the merged quarterly panel (319 GDP quarters, 1947Q1–2026Q3): 319 − 52 − 27 − 0 = 240 analysed.