This request stems from a related discussion, Banning Unregistered Users. According to a similar question on Meta.SO, the registered/unregistered status is not available in the SE data explorer, so I'm requesting summary statistics similar to the ones provided in Meta.SE and Meta.ServerFault. Ideally, the statistics would be for at least the past year as opposed to the past 60 days.
To be specific, I'll copy verbatim the request at Meta.SE, since mine is essentially the same:
I would like to have statistics for the quality of posts coming from unregistered versus registered accounts on my site.
It is my suspicion that people who are willing to put out the effort to register an account will also put more effort into writing good questions; I'd like to see some evidence for or against this.
I also suspect that on my site the vast majority of good questions and answers come from registered users, but again I'd like to see some data.
Is this already possible through the Data Explorer? If so, how? If not consider this a feature request.