easy · Quantitative Finance

When using a control variate X to estimate Y, what happens if the two variables are perfectly uncorrelated?

  1. The estimator becomes biased and no longer converges to the true mean.
  2. The standard error increases by a factor of √(2).
  3. The variance of the estimate is reduced to zero.
  4. The variance of the estimate remains the same as the raw Monte Carlo variance.

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