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marginalno_edge· equity· anomaly· factor· idiosyncratic-volatility

Idiosyncratic Volatility (JP Growth Stocks)

slug: idiosyncratic-vol-jp-growth

Idiosyncratic Volatility (JP Growth Stocks) backtest. Median Sharpe across 320 parameter sets is +0.13. p-value is 0.53. Max DD is -21.6%. Period: 2023-07-03 to 2026-06-01. Best Sharpe +1.61 is not the representative figure.

Verdict: marginal. Some parameter set has a p-value under 0.10, but the median itself misses promising (Sharpe > 0.5 and p-value < 0.05). Primary reason: no_edge. It is not regime, frequency, or cost, and the median does not clear the bar.

Performance summary

Sharpe (median)
+0.13
Max DD
-21.6%
Win rate
—
Alpha (ann.)
—
p-value
0.53
backtest period: 2023-07-03 → 2026-06-01
Sharpe across 320 grid runs:median 0.13best 1.61 (not representative)worst -1.12p25–p75 -0.23–0.41

Hypothesis

Ang, Hodrick, Xing, Zhang (2006): stocks with high idiosyncratic volatility earn lower returns. Idio vol = std(residuals) from market model (rolling OLS against N225). LONG lowest idio-vol, SHORT highest.

Why it didn't work

Across 320 grid combinations, median Sharpe=0.13, best=1.61. Primary failure mode: no_edge.

Facts (5)

Best grid Sharpe ratio is 1.61 (p=0.0077).
period 2023-07-03–2026-06-01; cost=5bps
sharpe_ratio1.61
cite ↗ /cite/idiosyncratic-vol-jp-growth-fact-best-sharpevia r-idiosyncratic-vol-jp-growth-0000
Median Sharpe across 320 grid runs is 0.13.
Full grid of 320 parameter combinations.
sharpe_ratio0.13
cite ↗ /cite/idiosyncratic-vol-jp-growth-fact-median-sharpe
Median Sharpe in DOWN regime is 0.33 across 320 runs.
Regime=DOWN, N225 SMA20/SMA60 classification.
sharpe_ratio0.33
cite ↗ /cite/idiosyncratic-vol-jp-growth-fact-regime-down
Median Sharpe in FLAT regime is 0.15 across 320 runs.
Regime=FLAT, N225 SMA20/SMA60 classification.
sharpe_ratio0.15
cite ↗ /cite/idiosyncratic-vol-jp-growth-fact-regime-flat
Median Sharpe in UP regime is -0.48 across 320 runs.
Regime=UP, N225 SMA20/SMA60 classification.
sharpe_ratio-0.48
cite ↗ /cite/idiosyncratic-vol-jp-growth-fact-regime-up

Runs (30)

runparamssharpeUPFLATDOWN
estimation_window=20, holding_days=1, n_stocks=5, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0000
cost_bps: 5
n_stocks: 5
regime_gate: false
+1.61+1.21+1.50+6.93
estimation_window=20, holding_days=1, n_stocks=5, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0001
cost_bps: 5
n_stocks: 5
regime_gate: true
+1.25-1.56+1.50+6.93
estimation_window=20, holding_days=1, n_stocks=5, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0002
cost_bps: 10
n_stocks: 5
regime_gate: false
+1.48+1.10+1.36+6.70
estimation_window=20, holding_days=1, n_stocks=5, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0003
cost_bps: 10
n_stocks: 5
regime_gate: true
+1.12-1.88+1.36+6.70
estimation_window=20, holding_days=1, n_stocks=50, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0012
cost_bps: 5
n_stocks: 50
regime_gate: false
+0.86+0.30+0.91+4.04
estimation_window=20, holding_days=5, n_stocks=5, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0017
cost_bps: 5
n_stocks: 5
regime_gate: true
+0.19+0.24-0.24+27.62
estimation_window=20, holding_days=5, n_stocks=50, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0030
cost_bps: 10
n_stocks: 50
regime_gate: false
+0.09-0.44+0.57-0.24
estimation_window=20, holding_days=10, n_stocks=20, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0043
cost_bps: 10
n_stocks: 20
regime_gate: true
-0.14-0.48-0.16+1.39
estimation_window=20, holding_days=20, n_stocks=20, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0056
cost_bps: 5
n_stocks: 20
regime_gate: false
+0.34-0.53+0.82+0.86
estimation_window=20, holding_days=60, n_stocks=5, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0064
cost_bps: 5
n_stocks: 5
regime_gate: false
+0.19+2.13-0.19-0.28
estimation_window=20, holding_days=60, n_stocks=10, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0070
cost_bps: 10
n_stocks: 10
regime_gate: false
+0.25+0.99+0.06+0.32
estimation_window=40, holding_days=1, n_stocks=5, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0083
cost_bps: 10
n_stocks: 5
regime_gate: true
+0.94-1.33+1.26+3.04
estimation_window=40, holding_days=5, n_stocks=5, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0096
cost_bps: 5
n_stocks: 5
regime_gate: false
+0.54-0.50+2.05+17.11
estimation_window=40, holding_days=5, n_stocks=50, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0109
cost_bps: 5
n_stocks: 50
regime_gate: true
+0.40-0.46+0.71+0.53
estimation_window=40, holding_days=10, n_stocks=20, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0122
cost_bps: 10
n_stocks: 20
regime_gate: false
-0.36-0.98-0.04-0.34
estimation_window=40, holding_days=20, n_stocks=10, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0135
cost_bps: 10
n_stocks: 10
regime_gate: true
+0.18-1.23+0.45-0.00
estimation_window=40, holding_days=60, n_stocks=10, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0148
cost_bps: 5
n_stocks: 10
regime_gate: false
+0.34+1.34+0.11-1.11
estimation_window=60, holding_days=1, n_stocks=5, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0161
cost_bps: 5
n_stocks: 5
regime_gate: true
+0.55-1.46+1.09+0.26
estimation_window=60, holding_days=1, n_stocks=50, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0174
cost_bps: 10
n_stocks: 50
regime_gate: false
+0.30-0.65+0.75+3.05
estimation_window=60, holding_days=5, n_stocks=20, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0187
cost_bps: 10
n_stocks: 20
regime_gate: true
+0.14-0.88+0.19+1.30
estimation_window=60, holding_days=10, n_stocks=5, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0195
cost_bps: 10
n_stocks: 5
regime_gate: true
-1.12-1.49-1.18-1.44
estimation_window=60, holding_days=10, n_stocks=20, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0201
cost_bps: 5
n_stocks: 20
regime_gate: true
-0.40-0.89-0.41+0.37
estimation_window=60, holding_days=20, n_stocks=10, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0214
cost_bps: 10
n_stocks: 10
regime_gate: false
-0.27-0.17-0.36+0.09
estimation_window=60, holding_days=60, n_stocks=5, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0227
cost_bps: 10
n_stocks: 5
regime_gate: true
-0.46-2.67-0.41-0.80
estimation_window=120, holding_days=1, n_stocks=5, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0240
cost_bps: 5
n_stocks: 5
regime_gate: false
+0.67+0.95+0.68-0.70
estimation_window=120, holding_days=1, n_stocks=5, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0241
cost_bps: 5
n_stocks: 5
regime_gate: true
+0.34-0.77+0.68-0.70
estimation_window=120, holding_days=1, n_stocks=50, cost_bps=10, regime_gate=False
r-idiosyncratic-vol-jp-growth-0254
cost_bps: 10
n_stocks: 50
regime_gate: false
+0.20-0.52+0.29+7.14
estimation_window=120, holding_days=5, n_stocks=20, cost_bps=10, regime_gate=True
r-idiosyncratic-vol-jp-growth-0267
cost_bps: 10
n_stocks: 20
regime_gate: true
-0.60-0.62-0.68-0.24
estimation_window=120, holding_days=10, n_stocks=20, cost_bps=5, regime_gate=False
r-idiosyncratic-vol-jp-growth-0280
cost_bps: 5
n_stocks: 20
regime_gate: false
-0.59-0.24-0.63-1.27
estimation_window=120, holding_days=20, n_stocks=10, cost_bps=5, regime_gate=True
r-idiosyncratic-vol-jp-growth-0293
cost_bps: 5
n_stocks: 10
regime_gate: true
+0.01+1.22-0.06-1.09

Target universe

Tokyo Stock Exchange Growth Market, ~495 stocks, tv >= 30M JPY
source: qbuntu-analysis · kabu STATION REST API + J-Quants daily bars
computed asof: 2026-09-24T02:22:19
view as Markdown ↗view as JSON ↗license: CC-BY-4.0

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