When I built RiskRadar, I needed to implement institutional-grade risk calculations. Most risk management tutorials either oversimplify ("just calculate standard deviation") or assume PhD-level math.
Here's the middle ground — the math you actually need to implement portfolio risk, explained for engineers.
Value at Risk (VaR): What's the Worst That Could Happen?
VaR answers: "What's the maximum I could lose in a day, with 95% confidence?"
If your portfolio's 1-day 95% VaR is $10,000, that means: on 95% of days, your losses won't exceed $10,000. On the other 5% of days... they might.
Three ways to calculate VaR:
Historical VaR (simplest)
Sort your historical daily returns. The 5th percentile is your 95% VaR.
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