Uses the 1/n covariance and the 1/n standard deviations, so the
divisors cancel and r matches the book's deviation form.
Arguments
- x, y
equal-length data vectors, n >= 2, neither constant.
References
Morin, D. J. (2016). Probability: For the Enthusiastic
Beginner. Createspace. Eqs (6.12), (6.55).
Examples
SampR(c(2, 3, 3, 5, 7), c(1, 1, 3, 4, 6))$r
#> [1] 0.942809
