Mathematical model that characterizes the connection or the relation of dependence between two statistical or probabilistic phenomena in which we observe that the ordered pairs of data seem to gather around a line.

This line is called the

line of regression.

- A
**positive linear correlation** corresponds to a correlation in which the line of regression has a positive slope.
- A
**negative linear correlation** corresponds to a correlation in which the line of regression has a negative slope.
- A
**zero linear correlation** corresponds to an absence of correlation.

### Examples

- Here is an example of weak positive linear correlation:

- Here is an example of medium negative linear correlation:

- Here is an example of zero linear correlation: