Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange
24

IMO applied mathematics is underrepresented across disciplines.


18

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, ...


15

Here is a snapshot of the site analytics to which Martin refers: So, roughly $40,000$ page views per day (in the summer). Might be interesting to know what happened on May 14th and on August 8th...


15

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.)         &...


13

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, ...


12

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!


11

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 ...


10

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 ...


10

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 ...


9

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 ...


9

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 ...


9

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. http://data.stackexchange.com/mathoverflow/query/264370/questions-with-most-answers


8

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 ...


8

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 ...


7

Here is a more complete data set obtained by this modified query. 1000 2500 5000 7500 10000 20000 9/28/2012: 10 2 9/28/2011: 51 17 5 3 2 9/28/2010: 176 73 33 23 17 4 9/28/2009: 753 359 193 132 96 28 1000 2500 ...


6

You can do this using a data explorer query or just using a plain search for [tag] answers:0. (For example.)


6

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 ...


5

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 ...


4

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) ...


3

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. Jan 26 Feb 23 Mar 22 Apr 29 May 22 Jun 44 Jul 33 Aug 32 Sep 49 Oct 50 Nov 49 Dec 69


3

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 Oct ...


2

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 ...


2

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 ...


2

Nonpositive score posts per month in 2013 Generated using this query. Q's A's 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


2

Number of answered questions per month in 2013 Generated using this query. All Answered Accepted Jan 961 722 453 Feb 1009 714 427 Mar 1031 723 429 Apr 1148 786 486 May 1188 799 501 Jun 1033 715 432 Jul 962 693 403 Aug 891 639 384 Sep 938 ...


2

Number of posts with positive score per month in 2013 Generated using this query. All Q's A's Jan 2003 787 1216 Feb 2036 804 1232 Mar 1984 793 1191 Apr 2186 908 1278 May 2241 925 1316 Jun 2002 863 1139 Jul 1998 846 1152 Aug 1827 776 1051 Sep 1838 813 1025 Oct 1912 852 1060 Nov 1927 867 1060 Dec 1807 733 1074


1

I would like to see more questions in free-probability, whose tag has 13 questions, or more generally in non-commutative probability. While this may be a relatively small area of mathematics it should interest many parties, namely, probability, combinatorics, and functional analysis.


Only top voted, non community-wiki answers of a minimum length are eligible