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

- month: 1990-01 .. 2023-04, 400 consecutive months, 0 gaps, 0 duplicates.
- Missing values: 0 in all columns. 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.
- Lag-1 autocorrelation: x 0.66, y 0.62 (persistent, as stated in TASK).
- No anomalies detected; no rows excluded (out/exclusions.csv). No availability-rule violations: memo used only for comparison.