For example, for the data that we did above, formula_2 was 0.8. So this means that there is a positive correlation. Because it is close to 1, it means that the link is strong between the two sets of data. So, we can say that those two sets of data are "linked", and go "up" together. If it was −0.8, we could say it was "linked" and as one goes up, the other goes down.