# Data audit
| file | sha256 | rows | cols |
|---|---|---|---|
| data/series.csv | c29dde22e215b14fe04d1786c9e9634c18863c78d1c283636e9cbfb31dabc514 | 400 | 3 (month str YYYY-MM, x float, y float) |
| data/memo.md | 0486b6a6e26671a53d02e9cf0ceee063479ea0a05bd07aadf76aa71e9d2a0568 | text | – |

- Date range 1990-01 to 2023-04; 399 consecutive one-month steps, no gaps; no duplicate months; no missing values.
- x: mean −0.134, sd 1.005, range [−2.69, 2.36]; y: mean 2.079, sd 0.904, range [0.004, 4.81]. Dimensionless. No anomalies.
- Lag-1 autocorrelation: x 0.66, y 0.62 (persistent, as stated in TASK.md).
- Information-availability: no violations; memo is an input to check, reproduced independently (intercept 2.0925, slope 0.1017, SE 0.0448, t 2.27, p 0.0238 all reproduced).
- Exclusions: none (out/exclusions.csv, 400 → 400).