Prices of secondhand Mazda cars
Drag the red line on the vertical axis of the scatterplot on the left to linearise the relationship with a log transformation. (Use the arrow keys to fine-tune.) A least squares line is fitted to the transformed variables and shown on the scatterplot.
The scatterplot on the right always displays the raw variables and shows the least squares line from the right as an equivalent curve on the original scale.
The data set contains the price and age of second hand Mazda cars that were advertised for sale in the Melbourne Age newspaper on 8 February 1992.