per-stock model-accuracy decomposition

9218.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	0.4682	0.4248 – 0.5565	12
Hit rate · SHORT	0.3391	0.2916 – 0.4220	12
Avg return · LONG (bps)	-107.8	-209.4 – -63.3	12
Avg return · SHORT (bps)	-195.0	-340.3 – -31.6	12
Selection rate · LONG	0.0067	0.0063 – 0.0081	12
Selection rate · SHORT	0.0076	0.0070 – 0.0085	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

-46.0

short

-83.7

total

-129.7

appearances 571584 · LONG 4115 · SHORT 4391

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