An association is nonlinear when there is some curvature present in the scatterplot.

The correlation is close to [r = —1], when the pattern slopes downwards strongly and the points do not deviate much from this sloping downwards pattern.

For example, the following graph then has a correlation close to [r = —1] while also being nonlinear (note: The correlation of this particular graph is 0.8941).

The correlation is close to [r = —1], when the pattern slopes downwards strongly and the points do not deviate much from this sloping downwards pattern.

For example, the following graph then has a correlation close to [r = —1] while also being nonlinear (note: The correlation of this particular graph is 0.8941).