per-stock model-accuracy decomposition

3989.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	0.3833	0.3491 – 0.4159	12
Hit rate · SHORT	0.6666	0.6240 – 0.6922	12
Avg return · LONG (bps)	-38.3	-78.5 – 41.9	12
Avg return · SHORT (bps)	72.3	30.9 – 111.9	12
Selection rate · LONG	0.0086	0.0077 – 0.0096	12
Selection rate · SHORT	0.0065	0.0052 – 0.0072	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

-15.9

short

35.6

total

19.7

appearances 816384 · LONG 6952 · SHORT 5201

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