Listening information indicating a number of audience members who switched stations during each of the designated periods of time is displayed on a graph having a plot representing the listening information. The graph is divided into an upper portion and a lower portion about a normalized line representing an average number of audience members who listened during designated periods of time. Additional plots can also be presented, including plots arranged so that portions above the normalized line represent a greater than average number of listeners, and portions below the normalized line represent a lower than average number of listeners.