per-stock model-accuracy decomposition

5248.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	0.4479	0.3972 – 0.4839	12
Hit rate · SHORT	0.1946	0.1156 – 0.3347	12
Avg return · LONG (bps)	-35.5	-91.9 – 30.7	12
Avg return · SHORT (bps)	-401.9	-502.6 – -273.5	12
Selection rate · LONG	0.0118	0.0101 – 0.0121	12
Selection rate · SHORT	0.0058	0.0052 – 0.0065	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

-26.5

short

-116.0

total

-142.5

appearances 555456 · LONG 6004 · SHORT 3316

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