Some analytics services do this for you automatically. Clicky has been doing it for for about three years, for example: http://encosia.com/how-30-seconds-droppe

Some analytics services do this for you automatically. Clicky has been doing it for for about three years, for example: http://encosia.com/how-30-seconds-dropped-my-bounce-rate-by-78/ http://encosia.com/how-30-seconds-dropped-my-bounce-rate-by-...