Shaddows - 3:41 pm on Apr 8, 2011 (gmt 0)
Categorize as what?
To drop into site-type (or page-type) buckets.
So, say you had an info site. Normal index data implies it is an authoritive source of information. User data, including bounce-rate, shows it satisfies casual users ("bounce" but not reclick), with while causes query refinement or non-bounce in "researchers". This would look like a page with good, clear information that might provoke further enquries.
Same traffic set, opposite behaviour. Researchers non-bounce or new-search. Casual searchers bounce and reclick. Might be a data-heavy or technical (jargony, academic, etc) page unsuitable for casual reading.
Or there might be a larger than expected non-bounce and bounce-reclick, indicating index data might need rechecking. Might be well-linked MFA.
Again, bounce-rate only makes sense when you have profiled the referring traffic. Google has, the site hasn't.