# Autocorrelation

Learn the basics of autocorrelation and how to identify it.

## We'll cover the following

## Understanding correlation

**Correlation** is a measure of the linear relationship between two numeric variables. In other words, it tells us how much two variables are related. A correlation coefficient is a number between

For example, if the correlation coefficient between two variables is

On the other hand, if the correlation coefficient is

Finally, if the correlation coefficient is zero (or close to zero), there is not much of a relationship between those two variables. An example could be average temperature and laptop sales.

If we plotted observations as dots in a plane where **scatterplot**), different correlation coefficients would yield different shapes.

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