Questions per Day
You can hover over the number to see the tooltip which says "3.5 questions per day on average over the last two weeks". I'm assuming that by average, it's referring to the mean.
Percentage Answered
According to this post:
We use numbers returned by the public /stats api, e.g. http://api.gaming.stackexchange.com/1.1/stats:
answeredPercentage = 100 - (total_unanswered / total_questions * 100); answerRatio = total_answers / (total_questions * answeredPercentage / 100);
But slightly confusingly, the api's return values for
total_questions
andtotal_answers
include closed questions, buttotal_unanswered
doesn't.So,
answeredPercentage
("% answered" on the stats page) is actually "percentage of questions that have been resolved" ...either by an answer or by closing.
I found this querythis query which seems to suggest that formula is still the same (93.8% answered according to SEDE, 94% displayed on Area 51).
'On Pace' Statistics
Zero per 30 days is equivalent to zero per 90 days. One per 30 days is equivalent to three per 90 days. Assuming that trusted user bonus doesn't count and the 5 points were only updated recently, twenty-five per 30 days is equivalent to 75 per 90 days.
However, I tried the figures, and it doesn't seem right: 44 users with > 200 rep on after 39 days, hence (44/39)
users/day, hence on pace for (44/39)*90
, which equals 102 users. Area 51 displays 69 users. I wonder if this is averaged over the last two weeks like the other figures?
Answer Ratio
The 'Answer Ratio' is given by total answers / (total questions * answered percentage / 100);
, as stated in the quote under 'Percentage Answered'.
Hence, the formula is, in effect: total answers / (questions with at least one answer + questions with no answers and are closed)
Views per Day
Like the questions per day, this is just averaged over two weeks (despite the tooltip not being there for the views). I've confirmed this on IoT using the site analytics, and it does seem to be correct, though.