There are badges that require a "positive question record", and this post gives the following way of calculating whether you have such a record.
(total questions - negative questions - closed - deleted)/total questions >= 0.5
I'm having trouble reconciling this, however, as I can't actually find records for my deleted questions.
Total questions: I'm guessing this includes not just the total of the questions listed on your profile, but also deleted ones. In my case, at the time this was written my RPG account has 7 questions on record, but I know there was a question that was deleted in the past. However; I can't see this anywhere.
There is a link to click for "deleted recent questions" but this only contains questions less than 60 days old, and apparently this question is older than that. If the fact that I can't find it means it doesn't count, this value is 7.
Negative questions: I'm not exactly sure what makes a question negative, but my best guess is it's "A question that has more down votes than up votes against it." By this definition I have one negative question on record now. While the deleted question was almost certainly negative, if I can't find it I can't verify/count which leaves only a value of 1.
Closed questions: Again, because the deleted question was (I'm pretty sure) closed first, it may count, but I can't find it so this should be 2.
Deleted questions: The whole point of this question - I can't find it to count it, or even verify that there are no further deleted questions.
From memory I believe the question that was deleted was negative and was first closed, so my calculation should be:
(7-1-1-0)/7=0.714 without the deleted question and (8-2-2-1)/8=0.375 with the deleted question accounted for.
I still don't qualify, so the second one is right. If this is how it's calculated, shouldn't I be able to access/verify records of deleted questions?