per-stock model-accuracy decomposition

6626.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	0.5060	0.4196 – 0.6744	12
Hit rate · SHORT	0.8807	0.7966 – 0.9195	12
Avg return · LONG (bps)	-16.9	-28.0 – 20.5	12
Avg return · SHORT (bps)	140.3	112.2 – 160.8	12
Selection rate · LONG	0.0022	0.0020 – 0.0027	12
Selection rate · SHORT	0.0013	0.0012 – 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

-2.0864

short

11.9

total

9.7701

appearances 698112 · LONG 1761 · SHORT 938

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