Week 40 Day 7: Building Your Risk Dashboard: Know What You Own

Your risk dashboard additions: (1) Portfolio standard deviation: 12% (for an 80/20 stock/bond split). (2) Expected worst-case annual return (2 sigma): -14%. (3) Maximum historical drawdown: approximately -40% (for 80/20). (4) Portfolio beta: 0.8. (5) Recovery time from worst drawdown: approximately 3-4 years historically. Can you sleep through all of that? If yes, your allocation is right. If no, add more bonds until you can.

Building the risk dashboard step by step: (1) Calculate portfolio standard deviation. For a simple VTI/BND mix: sigma_portfolio = sqrt((w_VTI^2 * sigma_VTI^2) + (w_BND^2 * sigma_BND^2) + (2 * w_VTI * w_BND * sigma_VTI * sigma_BND * rho)). At 80/20 VTI/BND, sigma_VTI = 16%, sigma_BND = 5%, rho = -0.1: sigma_portfolio = sqrt(0.64*0.0256 + 0.04*0.0025 + 2*0.8*0.2*0.16*0.05*(-0.1)) = sqrt(0.01638 + 0.0001 - 0.000256) = sqrt(0.01622) = 12.7%. (2) Calculate expected range. 68% of years: return between -2.7% and +22.7% (assuming 10% expected return). 95% of years: between -15.4% and +35.4%. (3) Estimate maximum drawdown. For 80/20: historical max drawdown approximately -36% to -42% (depending on the crisis). (4) Determine: can your portfolio recover before you need the money? If retirement is 20 years away, a 5-year recovery is fine. If retirement is 3 years away, a 5-year recovery is a problem. (5) Set your 'sleep at night' allocation. If the risk numbers from steps 1-4 would cause you to sell, reduce equity allocation by 10% and recalculate. Repeat until the numbers are tolerable. (6) Free tools: Portfolio Visualizer (portfoliovisualizer.com) calculates all of these metrics for any portfolio automatically. Enter your holdings, run the backtest, and see exact historical risk metrics.

The risk dashboard operationalizes the 'risk budgeting' approach from institutional portfolio management (Rahl, 2000; Litterman, 2004): rather than allocating by dollar weight (80% stocks, 20% bonds), allocate by RISK contribution. In an 80/20 portfolio, stocks contribute approximately 97% of portfolio risk and bonds contribute approximately 3%. The portfolio is far less diversified than the 80/20 label suggests. Risk parity (Qian, 2005; Bridgewater's All Weather fund) addresses this by equalizing the risk contribution of each asset class: if bonds contribute the same risk as stocks, the allocation shifts to approximately 25% stocks / 75% bonds (with bonds held at longer duration to increase their risk contribution or with leverage on bonds to equalize risk). The debate between traditional allocation (80/20) and risk parity is ongoing, but the key insight for individual investors is simpler: understand what percentage of your portfolio's risk comes from stocks (almost all of it) and ensure that risk level is tolerable. The practical risk assessment: multiply your portfolio value by the expected maximum drawdown. If your $500,000 portfolio has an expected max drawdown of -40%, you may temporarily lose $200,000. Write that number down. Look at it. If seeing $200,000 disappear from your account would cause you to sell, reduce equity exposure. This concrete, dollar-denominated loss projection is more behaviorally meaningful than abstract percentage-based risk metrics.