Add dataset statistics (durations, per-date and per-category breakdowns)

README.md

@@ -18,12 +18,38 @@ A multimodal egocentric manipulation dataset combining **Project Aria** smart-gl
 
 ## Overview
 
-- **25 trials**, **650 episodes**, ~1.8 GB
+- **25 trials**, **649 episodes**, **~62.7 min** of segmented manipulation, ~1.9 GB
 - **Recording dates**: 2026-01-10, 2026-01-21, 2026-01-28, 2026-04-30, 2026-05-06
-- **Camera**: Project Aria RGB (1408×1408, ~10 fps, H.264)
+- **Camera**: Project Aria RGB (1408×1408, **10 fps**, H.264)
 - **Tactile**: bilateral force totals (`action.tactile.left.force_total`, `action.tactile.right.force_total`)
 - **Hand pose**: Aria MPS hand tracking (left + right, validity flags, confidence)
 - **Gaze**: Aria MPS general eye gaze (yaw/pitch + depth)
+- **Mean episode length**: 5.8 s (37,633 frames @ 10 fps)
+
+## Dataset statistics
+
+### By recording date
+
+| Date       | Trials | Episodes | Frames | Duration (min) |
+|------------|-------:|---------:|-------:|---------------:|
+| 2026-01-10 |      3 |       42 |  3,565 |            5.9 |
+| 2026-01-21 |      7 |      137 | 11,106 |           18.5 |
+| 2026-01-28 |      5 |      132 |  8,481 |           14.1 |
+| 2026-04-30 |      2 |       82 |  4,761 |            7.9 |
+| 2026-05-06 |      8 |      256 |  9,720 |           16.2 |
+| **Total**  | **25** |  **649** | **37,633** |     **62.7** |
+
+### By object category
+
+| Category | Trials | Episodes | Frames | Duration (min) |
+|----------|-------:|---------:|-------:|---------------:|
+| Jelly    |      6 |      115 | 10,232 |           17.1 |
+| Bottle   |      4 |      186 |  8,947 |           14.9 |
+| Sponge   |      3 |      107 |  6,548 |           10.9 |
+| Water    |      4 |       70 |  4,860 |            8.1 |
+| Wangzai  |      4 |      116 |  4,294 |            7.2 |
+| Coke     |      2 |       19 |  1,512 |            2.5 |
+| Chip     |      2 |       36 |  1,240 |            2.1 |
 
 ## Layout