Kestrel causes of death
This diagram illustrates how bar height is defined by the frequency of the category or, equivalently, by its proportion.
Click on any bar (or any row in the frequency table) to highlight the category and draw arrows to the dual axes.
The data set shows the causes of death of kestrels (a bird of prey) in Britain between 1963 and 1997. (Carcasses were sent to the researchers in response to advertisements in bird-watching magazines and journals and the cause of death was found from information sent by the finder and examination of the carcass.)