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- > n <- 1e+5
- > y <- rnorm(n,mean=1)
- > x <- rexp(n)-2
- > mean(y)/sqrt(var(y) + mean(y)^2 + mean(x)^2*var(y)/var(x))
- [1] 0.5788539
- > cor(x,x*y)
- [1] 0.5751899
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