# Engineering Analysis/Correlation

## Independence edit

Two random variables are called **independent** if changes in one do not affect, and are not affected by, changes in the other.

## Correlation edit

Two random variables are said to have **correlation** if they take the same values, or similar values, at the same point in time. Independence implies that two random variables will be uncorrelated, but two random variables being uncorrelated does not imply that they are independent.