# Data audit
- File: data/firm_panel.csv, SHA-256 ae54378f63f4c9527cb2a1061d96d42eb1e45173bb8762a5998966cbfc9672e0
- 1200 rows x 4 columns: firm_id (int), year (int), x (float), y (float); dimensionless.
- firm_id 1001-1100 (100 firms), year 2008-2019 (12 years); every firm has exactly 12 years, every year 100 firms -> balanced.
- Missing values: 0 in all columns. Exact duplicate rows: 0. Duplicate (firm_id, year) keys: 0.
- x: mean -0.162, sd 1.258, range [-4.52, 3.30]; y: mean -0.424, sd 2.003, range [-6.29, 5.33]. No obvious anomalies.
- Rows in random order (sorted in analysis; irrelevant to estimates).
- Information availability: single permitted input; no violations.