Covariance of X with the square of a correlated normal
Question
Suppose is bivariate normal, each coordinate standard normal, with correlation . What is ?
Short answer
. Since , the covariance equals . The pair has the same joint law as , and changes sign under this flip, so its expectation is zero for every .
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- Continuous Random Variables and Probability Density Functions
- Covariance and Correlation
- The Normal Distribution
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