This section covers the idea of correlation through the use of proc corr .
Correlation is a measure of the strength of the relationship between two variables.
Proc corr Proc corr measures the correlation coefficient between two variables. If we take the absolute value of r , then a value closer to 1 has a stronger relationship. Negative correlations imply when one value goes up another goes down, positive correlations imply that when one variable goes up another goes up too. You should see that you have a correlation value of 1 across the downward diagonal, this is because it is taking the correlation of itself. In addition to the r value you will get a probability value.