GDP in the USA

The grey least squares line on the scatterplot on the left helps to show the curvature in the relationship between GDP and time.

The linked residual plot on the right highlights the curvature better. (Click on a cross on either plot to highlight the point on both plots.)

A quadratic model will explain the curvature later.

(The example on the General version of this page shows the value of residual plots better. Use the menu at the top of this page to see the General version.)

The data set shows how GDP has increased in the USA since 1960. The GDP has been measured in billion US dollars, corrected for inflation by expressing it in terms of 1996 dollars.