The formula is: Correlation wants to assess the linear relationship of two variables so what's really required is to see what amount of covariance those two variables have.

The covariance calculation shows how two stocks move together, which is helpful when building a diversified investment portfolio. Learn how this calculation is used.

For the unbalanced analysis of covariance model with one covariate, a simple formula is given for the intraclass correlation coefficient estimator that results from Henderson's Method 3 estimation of ...