This document provides a sample configuration for tunneling an IPv6 Routing Information Protocol (RIP), and an IPv6 Border Gateway Protocol (BGP) network and traffic through a pre-existing IPv4 network. This technique allows you to connect IPv6 sites over the IPv4 backbone that exists.
A correlation by itself is often not very informative. A large correlation does not necessarily indicate causality. If one or both of the variables involved in the correlation are related to some third variable, the correlation may change substantially when controlling for that third variable. In this case, the SAT I (aptitude) score is highly correlated with high school GPA and with subject achievement test scores on the SAT II.
Let PMCC(X,Y) be the Pearson product-moment correlation coefficient of two n-dimensional vectors X = {X1,X2,...,Xn} and Y = {Y1,Y2,...,Yn}. Let and be the arithmetic means of the elements in X and Y, respectively. Let sX and sY be the standard deviations of X and Y, respectively. Then, the following relations apply.