how can I compute the response rate on my forum

[Jnifoo]

Hi,
Have a question about statistics on vbulletin.
Using vb 3.6.8, with about 77k threads and 515k posts, I'm thinking about a statistic that is useful for newcomers : the response rate.
Actually, searching for that kind of plugin let me with no solution.

Any tips or solution your using in your forums to compute this kind of statistic :
- response rate on the whole forum
- response rate per forum

Any chance to get this stat with the average time for the first response ?

Think the only solution is to make the request with sql code, a basic solution for a first step is :

SELECT replycount, count( threadid ) AS nb FROM `thread`WHERE replycount =0
GROUP BY replycount

Thanks for your help.