```json { "action": "final", "content": "## Data Quality Assessment\n\nBased on a comprehensive scan of the `2010_2026_scores` table (6,185 games across 17 seasons), here are the data quality issues identified:\n\n### 1. **Missing Scores (837 games, 13.5%)**\nBoth `AwayScore` and `HomeScore` are NULL for 837 games. These fall into two categories:\n- **BYE weeks** (594 games with empty `GameDate`): Teams on bye have placeholder rows with no opponent or scores — this is structurally expected\n- **Future/TBD games** (24 games): Scheduled games not yet played, marked with `GameDate = 'TBD'`\n- **Playoff clinch markers** (remaining ~219): Rows like \"Clinched Playoffs\" that document postseason qualification rather than actual games\n\nThese aren't data errors but represent non-game events in the dataset's structure.\n\n### 2. **Inconsistent Date Formats**\nThe `GameDate` column (VARCHAR) mixes multiple formats:\n- Standard dates: \"September 24th\", \"December 15th\" (most common)\n- Empty strings: 594 occurrences (bye weeks)\n- Placeholder: \"TBD\" (24 future games)\n\nThis prevents direct date parsing and chronological sorting without preprocessing. The separate `Season` column (BIGINT 2010-2026) provides reliable temporal ordering.\n\n### 3. **Extreme but Valid Scores**\nFour games show unusually high scores (≥59 points):\n- **Highest**: MIA 70, DEN 20 (Week 3, 2023) — a legitimate blowout\n- **63 points**: LV 63, LAC 21 (Week 15, 2023)\n- **62 points**: NO 62, IND 7 (Week 7, 2011)\n- **59 points**: Multiple games (OAK 59 in 2010, BAL 59 in 2019, CHI 59 in 2026)\n\nThese are outliers but not errors — NFL games occasionally produce extreme scores. No negative values exist (minimum is 0.0 for both away/home).\n\n### 4. **No Duplicate Games**\nEvery combination of `Season`, `Week`, `GameDate`, `AwayTeam`, and `HomeTeam` is unique — no accidental duplicates.\n\n### 5. **Score Distribution Skew**\n- **Away scores**: mean 21.2, median 21.0, range 0–59\n- **Home scores**: mean 23.1, median 23.0, range 0–70\n\nHome teams average ~2 points higher (expected home-field advantage), but the 70-point maximum is a significant outlier (next highest is 63).\n\n### Summary\nThe primary quality issue is **inconsistent date formatting** (VARCHAR with mixed formats and placeholders), which complicates temporal analysis. The **missing scores** are structurally intentional (byes, future games, playoff markers) rather than data loss. **Extreme scores** are rare but valid. No impossible values (negatives, duplicates, or unit mixing) were found." } ```