# 木村工機 (6231.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**: 木村工機
- **Sector**: 機械
- **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/6231.T
- **JSON**: https://qbuntu.ai/v1/stocks/6231.T
- **License**: CC-BY-4.0

## Accuracy (median across grid)

Median LONG hit rate is 0.5219 — near a coin flip.

| metric | median | p25 | p75 | n |
|---|---:|---:|---:|---:|
| hit_rate_long | 0.5219 | 0.4940 | 0.5828 | 12 |
| hit_rate_short | 0.0899 | 0 | 0.3112 | 12 |
| avg_return_long_bps | -21.8 | -45.2 | 10.7 | 12 |
| avg_return_short_bps | -393.9 | -503.0 | -266.2 | 12 |
| selection_rate_long | 0.0027 | 0.0023 | 0.0034 | 12 |
| selection_rate_short | 0.0010 | 0.0005 | 0.0013 | 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: -0.5860
- short: -21.5
- total: -22.1
- appearances: LONG 1583 / SHORT 520 of 592896

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Research, not investment advice. These metrics describe model–stock fit, not the stock's merit.
Cite as: qbuntu (2026). 6231.T per-stock accuracy. https://qbuntu.ai/stocks/6231.T