# メディア工房 (3815.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**: メディア工房
- **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/3815.T
- **JSON**: https://qbuntu.ai/v1/stocks/3815.T
- **License**: CC-BY-4.0

## Accuracy (median across grid)

Median LONG hit rate is 0.4830 — near a coin flip.

| metric | median | p25 | p75 | n |
|---|---:|---:|---:|---:|
| hit_rate_long | 0.4830 | 0.4168 | 0.5393 | 12 |
| hit_rate_short | 0.1460 | 0.1340 | 0.3217 | 12 |
| avg_return_long_bps | -41.4 | -72.6 | -9.2585 | 12 |
| avg_return_short_bps | -430.1 | -534.1 | -396.0 | 12 |
| selection_rate_long | 0.0099 | 0.0086 | 0.0129 | 12 |
| selection_rate_short | 0.0083 | 0.0077 | 0.0094 | 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: -9.4921
- short: -58.6
- total: -68.1
- appearances: LONG 1508 / SHORT 1291 of 150528

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Research, not investment advice. These metrics describe model–stock fit, not the stock's merit.
Cite as: qbuntu (2026). 3815.T per-stock accuracy. https://qbuntu.ai/stocks/3815.T