per-stock model-accuracy decomposition

7908.T

computed asof 2026-08-07T09:15:52

read this first — not a buy signal

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.

Decomposes ml-factor-lgbm-9f-jp-growth. Standalone walk-forward run of the same LightGBM 9-factor family on the jp-listed universe (~4,100 tickers); the referenced record's verdict applies to the jp-growth universe only.

Accuracy (median across grid)

metric	median	p25 – p75	n
Hit rate · LONG	0.4980	0.4400 – 0.5483	12
Hit rate · SHORT	0.1497	0.0101 – 0.5271	12
Avg return · LONG (bps)	-47.9	-113.9 – -17.2	12
Avg return · SHORT (bps)	-1.6999	-40.3 – 104.1	12
Selection rate · LONG	0.0026	0.0018 – 0.0047	12
Selection rate · SHORT	0.0014	0.0009 – 0.0015	12

Hit rate ≈ 0.5 means the model's picks on this stock were near coin-flip. Returns in bps per trade (1 bps = 0.01%).

PnL contribution

long

-8.1056

short

1.1090

total

-6.9966

appearances 461568 · LONG 1433 · SHORT 555

Research, not investment advice. Metrics describe model–stock fit, not the stock's merit.