# 日本化薬 (4272.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**: 日本化薬
- **Sector**: 素材・化学
- **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/4272.T
- **JSON**: https://qbuntu.ai/v1/stocks/4272.T
- **License**: CC-BY-4.0

## Accuracy (median across grid)

Median LONG hit rate is 0.1714 — below a coin flip.

| metric | median | p25 | p75 | n |
|---|---:|---:|---:|---:|
| hit_rate_long | 0.1714 | 0.0395 | 0.3438 | 12 |
| hit_rate_short (thin n) | 1 | 1 | 1 | 1 |
| avg_return_long_bps | -155.6 | -186.7 | -50.2 | 12 |
| avg_return_short_bps (thin n) | 250.5 | 250.5 | 250.5 | 1 |
| selection_rate_long | 0.0001 | 0.0001 | 0.0002 | 12 |
| selection_rate_short | 0 | 0 | 0 | 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: -1.7045
- short: 0.0250
- total: -1.6795
- appearances: LONG 112 / SHORT 1 of 871680

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Research, not investment advice. These metrics describe model–stock fit, not the stock's merit.
Cite as: qbuntu (2026). 4272.T per-stock accuracy. https://qbuntu.ai/stocks/4272.T