hard · Quantitative Finance

A pairs-trading strategy monitors a spread with an annual mean-reversion speed κ = 15 and an annual volatility σ = 0.25.

What is the long-run (unconditional) standard deviation of this spread, which is often used to set entry Z-scores?

  1. 0.0167
  2. 0.0021
  3. 0.0456
  4. 0.0645

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