Ergodic theory usually has several papers in Annals and Inventiones each year, and is regularly mentioned when the work of recent Fields medalists is described (e.g. Avila, Lindenstrauss, Mirzakhani) but I think that there are no more than ten ergodic theorists who contribute regularly to MathOverflow.
Here is a nice statistic: since MathOverflow opened, ...
The average number of questions per day is relatively stable but the variance is considerable and shows weekly fluctuation patterns. Here is a data explorer query that shows the number of questions with nonnegative score per day, given month and year. (Use the 'fork query' button to play around with the code.)
A lot of MathOverflow data is already available publicly.
An anonymized version of the entire Stack Exchange Network database is archived every few weeks and permanently on archive.org. It's easy to download just the data for MathOverflow, which is currently 189.4M compressed. That data consists of 7 xml files (badges.xml, comments.xml, posts.xml, ...
This seems to be asking for rather a lot! Why don't you first produce this table, using either the Stack Exchange API or the Data Explorer. Both will provide the answers to your questions. After that, we can get to analysis and explanations!
I have one theory that may explain this trend. Specifically most of the questions I have wanted to ask have already been asked. I think this is a good thing in many respects. Not so good for the community, but great for learning. Namely you will see the number of questions new to be proportional to the number of users times the inverse of the probability of ...
As far as I know, there is no such thing. See also this post on Mathematics Meta.
Number of people online. On main meta you can find some feature requests such as View approximate number of users online or How many SO users are online?.
Depending on what purpose you want this for, perhaps some other measures might be useful for you.
On Math.SE you can see ...
These are rough numbers, I'm afraid - I'm combining data from Google Analytics and our internal event tracking system, so there's a reasonable chance we're measuring slightly different things. Hopefully, this is sufficient to give you a rough comparison:
In the past 30 days, MathOverflow has seen:
26,189 visits from Mathematics Stack Exchange
10,386 visits ...
This is a perfect task for the Stack Exchange Data Explorer, which allows you to make SQL queries to the database of any network site. Here is a query that gives the top 50 questions sorted by answer count.
Might be offtopic, but again maybe not. In any case this is not really answering the question, just some additional information (seemingly) related. I've rerun the query about total questions and answers together for the period indicated (could not run it for longer time stretch). What I've got is this:
Seems like for the first time in 2016 the total number ...
If you click on the number "0.0x%", the links gets you to reputation league for MathOverflow. (The link given in the question is actually list of the registered users and not the reputation league.)
As far as I know, only users from reputation leagues count for the purpose of these statistics. (That means that cut-off is at 200 reputation points. Notice the ...
If you Google for unanswered tag site:data.stackexchange.com you can find some already existing Data Explorer queries for this. For example:
Unanswered Questions by Tag: Shows the number of unanswered questions by tag for the most popular tags. The same query was used in a similar question on meta.math.SE.
Unanswered Questions by Tag: Shows all tags with at ...
I think some of the difference is do to questions now being only 5 points. Also with MSE and stricter interpretation of research level, questions have become more technical which means there are fewer questions I can answer and when I do answer a question there are fewer people following the question to upvote it.
I believe that my own accumulation of ...
The Data Explorer is the perfect tool for this kind of questions.
The highest possible single bounty is 500 points.
(For details of bounties, see this and this help page.)
See the query Questions that received a lot of bounty.
It gives a list of questions that have received more than one bounty, sorted by total amount.
These exceed 500 points:
When does a ...
I do not really have an answer, but let me at least provide some further SEDE queries, so that we have more data. (I only know very basics of SQL, but I hope that somebody more knowledgeable might have a look and spot if I made some mistakes in the queries. I have checked at least some of the numbers here in chat.)
I have linked to queries for MO below, you ...
You have tagged your post both (feature-request) and (support)
The feature-request part can be probably answered mainly by SE staff, which could say whether there are plans to implement something like this. However, there is also a similar feature request on the main meta: Filter users by country. So there you can see how it was received and maybe ...
Request renewed for the 2019 stats (and happy new 2020 to everyone!). I am surprised that this post was not created automatically on MO like on the other sites.
EDIT: and tagging this feature-request, otherwise no one at SE will see this (and I am not even sure it is sufficient, but I don't know what else I can do apart from pinging them in an unrelated ...
With Keith Kearnes participating on MathOverflow (and hopefully asking questions soon), I am confident that Universal Algebra will be represented to my satisfaction. Taking that personal perspective as a benchmark, I turn to the Tags page and note that the universal-algebra tag has been used 20 times this year for questions. I suggest that any tag that a) ...
Number of closed questions per month in 2013
Generated using this query, giving the number of questions asked during a certain month that were at the time of the query closed questions.
Number of new users per month in 2013
Generated using this query.
All >100 >200 >500 (rep)
Jan 406 76 14 4
Feb 442 66 11 2
Mar 450 70 11 2
Apr 497 55 12 1
May 558 79 21 6
Jun 905 282 14 4
Jul 1458 434 16 4
Aug 1278 307 22 5
Sep 1229 263 11 6
If this reflects all questions asked, I am then unsurprised. I think the query should be changed to reflect only answered questions plus those questions which are unanswered but not closed. There are many questions asked which are closed as off topic, and which go unanswered. If you eliminate those, you may find a different story.
Gerhard "We're Not Even ...
Gerhard Paseman's comment suggests that it might be interesting to know also how the number of active users changed over time. (Of course, this also depends on the definition of active.)
Here is a community wiki answer where we can collect various SEDE queries that show some data on this. Feel free to add other queries that might be interesting in ...
Probably various statistics about this can be found - and it all depends a bit on how you define best time. I have tried to make at least some queries using Data Explorer. (Notice that it is possible to change the site in the queries, so you can compare the stats with some other sites.) Since I am pretty sure that there are many users on this site with great ...
Nonpositive score posts per month in 2013
Generated using this query.
Jan 174 115
Feb 205 135
Mar 238 121
Apr 240 151
May 263 167
Jun 170 101
Jul 106 116
Aug 93 115
Sep 98 125
Oct 129 158
Nov 113 110
Dec 180 143