What are Four Different Types of Correlations?

The four different types of correlations are positive, negative, zero, and nonlinear correlations. In a positive correlation, as one variable increases, the other also increases. In a negative correlation, as one variable increases, the other decreases. A zero correlation indicates no relationship between the variables, while a nonlinear correlation shows a relationship that does not follow a straight line, meaning the association changes in strength or direction at different levels of the variables.