Could someone please explain it to me what is the difference between Variance and Covariance?
Sep 6, 2013 #1 DUET 55 0 Could someone please explain it to me what is the difference between Variance and Covariance?
Sep 6, 2013 #2 HallsofIvy Science Advisor Homework Helper 41,847 969 "Variance" applies to a single random variable. "Covariance" applies to two or more related random variables.
"Variance" applies to a single random variable. "Covariance" applies to two or more related random variables.
Sep 6, 2013 #4 mathman Science Advisor 8,047 535 DUET said: Could you please give me an example? Let X and Y be random variables. var(X) = E(X2) - E(X)2 cov(XY) = E(XY) - E(X)E(Y) E(..) means average.
DUET said: Could you please give me an example? Let X and Y be random variables. var(X) = E(X2) - E(X)2 cov(XY) = E(XY) - E(X)E(Y) E(..) means average.