Actually there is more to it than that. For years SiteCat did not have a
bounce metric out of the box. You had to define one as a custom metric.
Then in 2012 Bounce rate was added, however it does *not* treat as a
bounce a page where an instance of an evar is set, ie if you interact
with the page in some way, make a selection or similar; that sets an
eVar typically by s.tl() call. These are not regarded as bounces in "new
money". Consider a store finder page use case. 😉