# エーアイ (4388.T) — per-stock model accuracy

> Model predictability decomposition: measures how accurately the ml-factor-lgbm-9f-jp-growth model family predicts this stock's returns within the jp-listed universe. High hit_rate_long does NOT mean 'good stock to buy' -- it means 'the model historically predicted this stock well when selecting it LONG'. This is a property of model-stock fit, not intrinsic stock quality.

- **Name**: エーアイ
- **Sector**: 情報通信・サービスその他
- **Universe**: jp-listed
- **Decomposes**: `ml-factor-lgbm-9f-jp-growth` (strategy verdict: marginal) — https://qbuntu.ai/strategies/ml-factor-lgbm-9f-jp-growth
- **Computed asof**: 2026-10-01T02:33:09
- **HTML**: https://qbuntu.ai/stocks/4388.T
- **JSON**: https://qbuntu.ai/v1/stocks/4388.T
- **License**: CC-BY-4.0

## Accuracy (median across grid)

Median LONG hit rate is 0.3613 — below a coin flip.

| metric | median | p25 | p75 | n |
|---|---:|---:|---:|---:|
| hit_rate_long | 0.3613 | 0.3255 | 0.4100 | 12 |
| hit_rate_short | 0.7435 | 0.6980 | 0.7614 | 12 |
| avg_return_long_bps | -26.9 | -75.0 | -3.3315 | 12 |
| avg_return_short_bps | 425.7 | 347.4 | 542.3 | 12 |
| selection_rate_long | 0.0116 | 0.0102 | 0.0149 | 12 |
| selection_rate_short | 0.0159 | 0.0147 | 0.0180 | 12 |

Hit rate ≈ 0.5 means the model's picks on this stock were near coin-flip. Returns in bps/trade. Metrics with n = 0 are omitted; n < 5 is a thin sample.

## PnL contribution

- long: -13.0
- short: 182.4
- total: 169.4
- appearances: LONG 2706 / SHORT 3857 of 221184

---

Research, not investment advice. These metrics describe model–stock fit, not the stock's merit.
Cite as: qbuntu (2026). 4388.T per-stock accuracy. https://qbuntu.ai/stocks/4388.T