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README.md

@@ -82,6 +82,65 @@ data/
 
 Each stage is an independent config. Use `load_dataset(repo, config_name)` to load a specific stage. Most users will want **stage4** (fully processed) or **stage1** (original filtered tables).
 
+## Dataset Statistics
+
+| Stage | Tables | Files | Size | Rows (mean) | Rows (median) | Cols (mean) | Cols (median) |
+|-------|--------|-------|------|-------------|---------------|-------------|---------------|
+| stage1 | 2,988,000 | 7,470 | 107.1 GB | 1,042 | 113 | 6 | 4 |
+| stage2 | 2,210,180 | 14,879 | 75.2 GB | 1,271 | 116 | 6 | 5 |
+| stage3 | 2,210,043 | 14,879 | 92.3 GB | 1,270 | 116 | 6 | 5 |
+| stage4 | 2,117,811 | 14,879 | 198.6 GB | 1,232 | 117 | 6 | 5 |
+
+**Pass-through rates:**
+
+- Stage 1 to Stage 2: 74.0%
+- Stage 2 to Stage 3: 100.0%
+- Stage 3 to Stage 4: 95.8%
+
+### Column Types (stage2)
+
+| Type | Count | % |
+|------|-------|---|
+| categorical | 3,766,554 | 30.3% |
+| ambiguous | 3,526,030 | 28.4% |
+| continuous | 3,332,725 | 26.8% |
+| likely_text_or_id | 1,808,006 | 14.5% |
+
+### Column Types (stage3)
+
+| Type | Count | % |
+|------|-------|---|
+| categorical | 3,766,202 | 30.3% |
+| ambiguous | 3,525,681 | 28.4% |
+| continuous | 3,332,522 | 26.8% |
+| likely_text_or_id | 1,807,915 | 14.5% |
+
+### ML Classifications (stage3)
+
+| Classification | Count | % |
+|----------------|-------|---|
+| categorical | 5,512,597 | 51.9% |
+| continuous | 4,550,758 | 42.8% |
+| needs_llm_review | 561,050 | 5.3% |
+
+### Classification Sources (stage3)
+
+| Source | Count | % |
+|--------|-------|---|
+| heuristic | 7,098,724 | 66.8% |
+| ml_high | 2,094,239 | 19.7% |
+| ml_medium | 870,392 | 8.2% |
+| ml_low | 561,050 | 5.3% |
+
+### Column Types (stage4)
+
+| Type | Count | % |
+|------|-------|---|
+| categorical | 3,718,359 | 30.8% |
+| ambiguous | 3,371,838 | 27.9% |
+| continuous | 3,284,452 | 27.2% |
+| likely_text_or_id | 1,711,168 | 14.2% |
+
 ## Processing Pipeline
 
 ### Stage 1 — Filter