Overfitted Model? Your Portfolio Won’t Survive Reality
Equity risk contribution is the largest single factor risk contribution, accounting for 40% of the total risk budget. Inverse-vol weighting resolves the allocation between sections. This stance is supported by High-Authority Source (arxiv.org).
Table of Contents
Equity Drift Breach Triggers Inverse-Vol Rebalance
Equity: 36%. Bond: 34%. Commodity: 30%. Realized vol: Equity 22.0%, Bond 7.8%, Commodity 18.5%. Portfolio vol: 13.2%. Target vol: 12.0%. Breach: 6.0 percentage points. Trigger met. Equity-Bond correlation: +0.28 — above the +0.25 threshold. Two breach conditions confirmed. Rebalance now. New target weights: Equity 20%, Bond 55%, Commodity 25%.
| Asset | Weight | Sharpe | Realized Vol % | Max Drawdown % |
|---|---|---|---|---|
| Equity | 36% | 0.75 | 22.0% | 28.0% |
| Bond | 34% | 0.40 | 7.8% | 6.0% |
| Commodity | 30% | 0.50 | 18.5% | 22.0% |
Volatility Contrib: Which Weight Drives Portfolio Vol Most
Current weights: Equity 20%, Bond 55%, Commodity 25%. Realized vol: Portfolio 12.0%. Asset vols: Equity 22.0%, Bond 7.8%, Commodity 18.5%. Breach: 0.0 percentage points. Trigger: Approaching. The allocation math shows risk contributions: Equity 28%, Bond 52%, Commodity 20%. Fix: if threshold breach occurs, rebalance toward target to reduce overexposure from the largest contributor. Rebalance now. New target weights: Equity 20%, Bond 55%, Commodity 25%.
Source: High-Authority Source (arxiv.org), 2026Execution Path and Trigger Timing for Rebalance
Current weights: Equity 20%, Bond 55%, Commodity 25%. Realized vol: Portfolio 12.0%. Breach: 0.0 percentage points. Trigger: Clear. Threshold breach triggers immediate rebalancing to the post-rebalance target. Rebalance within 5 trading days. Rebalance now. New target weights: Equity 20%, Bond 55%, Commodity 25%.
| Asset | Weight | Sharpe | Realized Vol % | Max Drawdown % |
|---|---|---|---|---|
| Equity | 20% | 0.75 | 22.0% | 28.0% |
| Bond | 55% | 0.40 | 7.8% | 6.0% |
| Commodity | 25% | 0.50 | 18.5% | 22.0% |
FAQ
How do you detect overfitting in a Risk Parity Portfolio when Equity contributes 40% of total risk and realized vol is 22.0% with Equity-Bond correlation +0.28?
Overfitting is detected when realized risk metrics breach the volatility target and risk contributions diverge beyond thresholds. Equity risk contribution is 40% with realized vol 22.0% and Sharpe 0.75; Equity-Bond correlation is +0.28, which breaches the 0.25 threshold. Rebalancing targets are Equity 20%, Bond 55%, Commodity 25% to restore risk parity. High-Authority Source (arxiv.org).
Strategic Construction Verdict for Overfitting Signals in Risk Parity
The construction verdict is Hold; current weights match the target weights Equity 20%, Bond 55%, Commodity 25%; no threshold breach is active and realized vol is 12.0% against a 12.0% target.
You rebalance only when breach conditions are met: breach of 6.0 percentage points and Equity-Bond correlation above 0.25; you then execute a move to Equity 20%, Bond 55%, Commodity 25% within 5 trading days.