# はてな (3930.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**: はてな
- **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/3930.T
- **JSON**: https://qbuntu.ai/v1/stocks/3930.T
- **License**: CC-BY-4.0

## Accuracy (median across grid)

Median LONG hit rate is 0.3598 — below a coin flip.

| metric | median | p25 | p75 | n |
|---|---:|---:|---:|---:|
| hit_rate_long | 0.3598 | 0.2235 | 0.4713 | 12 |
| hit_rate_short | 1 | 1 | 1 | 11 |
| avg_return_long_bps | 4.8472 | -103.6 | 235.7 | 12 |
| avg_return_short_bps | 241.8 | 139.3 | 263.0 | 11 |
| selection_rate_long | 0.0038 | 0.0020 | 0.0040 | 12 |
| selection_rate_short | 0.0007 | 0.0005 | 0.0010 | 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: 7.8819
- short: 2.5144
- total: 10.4
- appearances: LONG 508 / SHORT 134 of 145152

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Research, not investment advice. These metrics describe model–stock fit, not the stock's merit.
Cite as: qbuntu (2026). 3930.T per-stock accuracy. https://qbuntu.ai/stocks/3930.T