# Verification checks (P4)

• Clean re-run of out/analysis.py (outputs deleted first): results.json, analytic.csv, exclusions.csv byte-identical (SHA-256): PASS

• data/firms.csv SHA-256 unchanged: PASS

• analytic rows == n_analysed: PASS

• n_unique - n_missing == n_analysed: PASS

• ledger first n_before == n_input_rows: PASS

• ledger last n_after == n_analysed: PASS

• ledger n_before-n_removed==n_after: PASS

• ledger chaining: PASS

• n_input - total removed == n_analysed: PASS

• firm_id unique in analytic: PASS

• no NaN revenue_musd: PASS

• mean recomputed: PASS

• median recomputed: PASS

• se>0: PASS

• revenue_musd within plausible range (0,10000): PASS

• raw baseline >> cleaned mean (unit inflation): PASS

• range revenue_musd: 5.742 2057.575