Data audit (P1)
| file | sha256 | rows | cols |
|---|---|---|---|
| data/design.csv | b1a17a529973e7994bbedad5ec1bc73fe968c777301ca8745657ea300e3c74f0 | 30 | 3 (i, x, sigma) |
- Schema: i int 1..30 contiguous, sorted; x float (dimensionless) in [-1.3942, 1.9919], mean 0.2823, sd 0.8212; sigma float (dimensionless) in [0.6034, 1.7903], mean 0.8195, all > 0.
- Missing values: 0. Duplicate rows: 0. No dates (synthetic fixed design).
- Anomalies: none. Note (design feature, not a defect): sigma rises with |x - xbar| (corr 0.837), i.e. error variance largest at high-leverage points -> conventional SE expected to understate the slope SD.
- Information-availability: the only input is the allowed design file; no violations. Nothing excluded (out/exclusions.csv: 30 -> 30).