A Survey of Means, Meaning, and Meanness
Summary:
Here are all SE sites, each with data from the 50 newest questions, and sorted on mean then median. Read-time data was gathered around 01:00 UTC on Sunday, August 26th, 2012. Here’s the tl;dr for those who don’t care to peer more deeply:
- ELU has a fairly low mean at rank #83/90, but if you notice who comes before us, this isn’t saying as much as one might think.
- ELU is tied for second place with Academia.SE for having the highest median.
- ELU is ranked #18/90 in its standard deviation.
- ELU has a unique mode, with scores −1 and −2 being tied for the most votes at 8 apiece. I do not know how to sort on mode.
Site Min Max Mean Median Stdev Mode
===============================================================================
SharePoint -4 1 -0.02 0.0 0.62 46 × 0
WordPress -1 2 0.00 1.0 0.45 43 × 0
Server Fault -2 1 0.04 0.5 0.49 41 × 0
Stack Overflow -2 2 0.08 0.5 0.59 41 × 0
Game Development -8 9 0.14 0.0 2.33 17 × 0
Drupal Answers -1 2 0.14 0.5 0.49 43 × 0
Web Applications -4 2 0.16 0.5 1.30 23 × 0
English Language and Usage -5 14 0.18 8.0 3.34 8 × (-2, -1)
Super User -2 3 0.20 0.0 0.72 36 × 0
Meta Stack Overflow -14 19 0.30 -5.0 5.23 12 × 0
Ask Different -2 6 0.44 0.5 1.15 29 × 0
SmugMug -1 2 0.46 1.0 0.75 26 × 0
Ask Ubuntu -1 6 0.52 1.5 1.20 30 × 0
OnStartups -3 9 0.58 -1.5 1.78 20 × 0
Webmasters -2 5 0.74 0.0 1.61 30 × 0
Quantitative Finance -5 11 0.88 7.0 3.69 7 × (3, 0)
Android Enthusiasts -4 5 0.90 0.5 1.76 22 × 0
Cryptography -4 5 0.90 -2.5 1.72 16 × 0
Software Quality Assurance and Te 0 4 0.92 0.0 1.09 22 × 0
Audio-Video Production -1 5 0.98 1.5 1.17 21 × 0
Electrical Engineering -4 7 1.00 2.5 2.30 16 × 0
Arqade -6 6 1.02 2.0 2.01 15 × 1
Database Administrators -2 4 1.06 0.5 1.16 17 × 1
Programmers -5 11 1.18 0.5 3.69 10 × 0
Graphic Design -2 6 1.20 1.0 1.61 19 × 0
Personal Finance and Money -1 6 1.24 0.5 1.42 16 × 0
Code Review -1 5 1.26 2.0 1.48 19 × 0
Signal Processing -2 6 1.26 2.5 1.94 19 × 0
Physics -4 8 1.34 2.5 1.91 16 × 1
GIS -3 8 1.36 1.0 2.20 15 × 0
Mathematics 0 7 1.46 2.0 1.77 19 × 0
Cross Validated 0 5 1.52 1.5 1.42 16 × 0
Home Improvement -1 6 1.56 1.0 1.56 15 × 0
Unix and Linux -2 6 1.62 1.0 1.41 15 × 1
Philosophy -3 7 1.64 0.5 2.23 14 × 0
Salesforce -7 7 1.64 5.0 2.23 14 × 1
IT Security -5 8 1.68 -2.5 2.22 12 × 0
Sports -6 10 1.74 -5.0 3.07 11 × 3
Chemistry -3 7 1.80 1.5 2.09 12 × 1
Motor Vehicle Maintenance and Rep 0 6 1.92 3.5 1.25 14 × (1, 2)
Bicycles -4 13 1.98 -2.0 2.86 10 × 1
Writers -3 9 2.00 2.0 2.28 10 × 0
Physical Fitness -2 8 2.10 2.0 1.75 12 × (3, 2)
Stack Apps 0 12 2.20 0.5 2.49 14 × 1
Homebrewing 0 9 2.24 2.5 1.80 11 × 2
Bitcoin 0 8 2.24 6.0 1.59 16 × 3
User Experience -3 25 2.28 3.0 4.19 12 × 1
Poker -2 9 2.32 2.5 2.01 11 × 3
TeX - LaTeX 0 7 2.34 4.5 1.89 14 × 1
Chinese Language and Usage -1 9 2.40 2.0 2.08 12 × (2, 1)
Movies and TV -6 9 2.40 -2.0 2.62 12 × 3
Gardening and Landscaping -2 14 2.42 4.0 2.40 13 × 2
Mi Yodeya -6 10 2.58 1.0 2.93 9 × (2, 0)
Computer Science -4 11 2.60 3.0 2.52 13 × 2
Photography -1 12 2.62 2.5 2.81 10 × 3
Windows Phone -1 7 2.68 4.5 1.70 15 × 3
History -6 13 2.70 1.0 3.60 9 × 2
Board and Card Games -1 8 2.70 3.0 2.19 11 × 1
Seasoned Advice -4 18 2.82 0.5 3.42 9 × 3
Personal Productivity -1 8 2.82 3.0 2.52 16 × 1
Russian Language and Usage 0 7 2.84 3.5 1.65 14 × 2
Islam -2 9 2.90 3.0 2.05 16 × 3
Musical Practice and Performance -3 10 2.96 3.5 3.03 8 × (3, 5)
Theoretical Computer Science -5 20 3.24 7.0 5.58 7 × 0
Biblical Hermeneutics -1 8 3.32 3.0 2.02 12 × 4
Parenting -1 12 3.34 2.0 2.75 12 × 3
Biology -1 12 3.42 4.5 2.78 9 × 4
Project Management -4 10 3.46 3.5 2.81 8 × (3, 1)
Computational Science -1 9 3.46 5.5 2.33 8 × (3, 2)
Linguistics 0 22 3.52 4.0 3.63 11 × (3, 2)
Martial Arts -1 8 3.60 0.5 2.08 11 × (3, 4)
Spanish Language and Usage -2 16 3.76 4.5 2.81 16 × 3
The Great Outdoors -3 10 3.78 4.5 2.21 10 × 5
Christianity -4 12 3.82 4.5 3.04 13 × 4
Raspberry Pi 1 10 3.98 3.0 2.40 11 × 2
Cognitive Sciences -4 26 4.04 2.0 4.46 7 × (6, 3)
Mathematica -9 17 4.06 4.0 5.08 9 × 2
Code Golf -3 22 4.22 0.0 5.13 7 × 0
German Language and Usage -2 19 4.32 1.0 3.78 13 × 2
Role-playing Games -6 26 4.38 2.5 4.37 11 × 3
Libraries and Information Science 0 12 4.42 7.5 2.64 10 × 3
Chess -1 12 4.46 4.0 2.47 12 × 4
Travel 0 21 4.50 4.5 3.24 9 × 4
French Language and Usage 0 10 4.50 5.0 2.44 10 × 6
Japanese Language and Usage 0 13 4.92 2.5 2.93 8 × 6
LEGO® Answers 1 11 4.96 4.5 2.79 11 × 3
Science Fiction and Fantasy 0 18 5.16 0.5 4.04 9 × 3
Skeptics -4 90 5.88 7.5 12.78 7 × (-1, 5)
Academia -3 32 6.40 8.0 5.60 9 × 5
The Workplace -7 36 8.42 8.5 7.74 6 × (7, 12, 5)
Shell script available upon email request; requires perl
because I’m me, and wget
because I’m lazy. Site list is dynamically generates as new SE sites added.
Old Posting
I don’t believe that ELU is especially different in this compared to other StackExchange sites of its type. In particular, both the mean and median score of questions on the ELU front page are each comparatively high, but so too is our standard deviation and the ratio of our standard deviation to our mean.
We also have a curious mode: only one other site besides ELU has a mode (most frequent score) that includes a negative score, and that is the Skeptics.SE site. We have 6 questions at −2, while they had 4 at −1. It makes you wonder what sort of questions they draw, and why they are like us in this regard. However, Skeptics.SE also has the highest mean of all sites surveyed, so they are different from us in that regard.
Meanwhile, here is the same dataset sorted a variety of ways. The primary sort column is starred.
Sorted on Mean
Here are a bunch of SE sites’ stats as of a snapshot from a little while ago, sorted on ascending mean:
Site N Min Max *Mean Median Stdev Std/Mean Mode
======================================================================
so 90 -3 6 0.46 1.00 1.30 2.86 58 × 0
wordpress 48 0 4 0.50 0.00 0.94 1.87 34 × 0
superuser 31 -1 9 0.55 0.00 1.64 3.00 21 × 0
ask-ubuntu 48 0 7 0.83 0.50 1.33 1.59 27 × 0
webmasters 48 -2 5 0.85 0.00 1.46 1.71 25 × 0
apple 48 0 12 1.35 1.00 2.21 1.63 21 × 0
dba 48 -2 10 1.54 1.50 2.19 1.42 16 × 0
physics 48 0 20 2.40 2.50 3.11 1.30 13 × 1
serverfault 48 -1 76 2.62 0.50 11.09 4.23 25 × 0
it-sec 47 0 21 3.38 7.00 3.82 1.13 9 × 3
math 48 0 16 3.73 8.50 4.19 1.12 13 × 1
arcade 48 -3 23 3.73 3.00 4.77 1.28 12 × 1
elu 46 -3 37 4.04 3.00 7.02 1.73 6 × (-2, 0, 2)
elu-meta 43 -6 29 4.37 -3.00 6.78 1.55 7 × 1
spanish 48 -2 20 4.48 2.50 3.81 0.85 12 × 3
german 48 -2 19 5.21 8.00 4.48 0.86 11 × 2
tex 48 0 28 5.35 6.00 6.20 1.16 9 × 4
cs-theory 44 -3 25 5.55 4.50 5.96 1.08 5 × (0, 4)
scifi 38 0 30 6.26 7.50 5.54 0.88 5 × (3, 4, 5)
codegolf 48 -3 29 7.77 3.00 7.77 1.00 6 × 4
rpg 48 -1 46 8.48 3.00 9.00 1.06 8 × 3
programmers 34 0 65 10.38 17.50 14.52 1.40 5 × 6
so-meta 46 -5 175 11.46 1.50 32.65 2.85 13 × 0
skeptics 46 -1 90 12.91 15.50 15.38 1.19 4 × (-1, 5)
======================================================================
Site N Min Max *Mean Median Stdev Std/Mean Mode
Sorted on Median
Even if you sort on the median score, defined as half being above and half being below, then again, ELU comes out much better than many more frequently visited sites:
Site N Min Max Mean *Median Stdev Std/Mean Mode
======================================================================
wordpress 48 0 4 0.50 0.00 0.94 1.87 34 × 0
superuser 31 -1 9 0.55 0.00 1.64 3.00 21 × 0
webmasters 48 -2 5 0.85 0.00 1.46 1.71 25 × 0
ask-ubuntu 48 0 7 0.83 0.50 1.33 1.59 27 × 0
serverfault 48 -1 76 2.62 0.50 11.09 4.23 25 × 0
so 90 -3 6 0.46 1.00 1.30 2.86 58 × 0
apple 48 0 12 1.35 1.00 2.21 1.63 21 × 0
dba 48 -2 10 1.54 1.50 2.19 1.42 16 × 0
so-meta 46 -5 175 11.46 1.50 32.65 2.85 13 × 0
physics 48 0 20 2.40 2.50 3.11 1.30 13 × 1
spanish 48 -2 20 4.48 2.50 3.81 0.85 12 × 3
arcade 48 -3 23 3.73 3.00 4.77 1.28 12 × 1
elu 46 -3 37 4.04 3.00 7.02 1.73 6 × (-2, 0, 2)
codegolf 48 -3 29 7.77 3.00 7.77 1.00 6 × 4
rpg 48 -1 46 8.48 3.00 9.00 1.06 8 × 3
cs-theory 44 -3 25 5.55 4.50 5.96 1.08 5 × (0, 4)
tex 48 0 28 5.35 6.00 6.20 1.16 9 × 4
it-sec 47 0 21 3.38 7.00 3.82 1.13 9 × 3
scifi 38 0 30 6.26 7.50 5.54 0.88 5 × (3, 4, 5)
german 48 -2 19 5.21 8.00 4.48 0.86 11 × 2
math 48 0 16 3.73 8.50 4.19 1.12 13 × 1
skeptics 46 -1 90 12.91 15.50 15.38 1.19 4 × (-1, 5)
programmers 34 0 65 10.38 17.50 14.52 1.40 5 × 6
======================================================================
Site N Min Max Mean *Median Stdev Std/Mean Mode
Sorted on Standard Deviation
One area were we come up high is our standard deviation compared with that of other sites, and not unsuprisingly, also the ratio of the standard deviation to the mean. Here is the same dataset sorted on ascending standard deviation:
Site N Min Max Mean Median *Stdev Std/Mean Mode
======================================================================
wordpress 48 0 4 0.50 0.00 0.94 1.87 34 × 0
so 90 -3 6 0.46 1.00 1.30 2.86 58 × 0
ask-ubuntu 48 0 7 0.83 0.50 1.33 1.59 27 × 0
webmasters 48 -2 5 0.85 0.00 1.46 1.71 25 × 0
superuser 31 -1 9 0.55 0.00 1.64 3.00 21 × 0
dba 48 -2 10 1.54 1.50 2.19 1.42 16 × 0
apple 48 0 12 1.35 1.00 2.21 1.63 21 × 0
physics 48 0 20 2.40 2.50 3.11 1.30 13 × 1
spanish 48 -2 20 4.48 2.50 3.81 0.85 12 × 3
it-sec 47 0 21 3.38 7.00 3.82 1.13 9 × 3
math 48 0 16 3.73 8.50 4.19 1.12 13 × 1
german 48 -2 19 5.21 8.00 4.48 0.86 11 × 2
arcade 48 -3 23 3.73 3.00 4.77 1.28 12 × 1
scifi 38 0 30 6.26 7.50 5.54 0.88 5 × (3, 4, 5)
cs-theory 44 -3 25 5.55 4.50 5.96 1.08 5 × (0, 4)
tex 48 0 28 5.35 6.00 6.20 1.16 9 × 4
elu-meta 43 -6 29 4.37 -3.00 6.78 1.55 7 × 1
elu 46 -3 37 4.04 3.00 7.02 1.73 6 × (-2, 0, 2)
codegolf 48 -3 29 7.77 3.00 7.77 1.00 6 × 4
rpg 48 -1 46 8.48 3.00 9.00 1.06 8 × 3
serverfault 48 -1 76 2.62 0.50 11.09 4.23 25 × 0
programmers 34 0 65 10.38 17.50 14.52 1.40 5 × 6
skeptics 46 -1 90 12.91 15.50 15.38 1.19 4 × (-1, 5)
so-meta 46 -5 175 11.46 1.50 32.65 2.85 13 × 0
======================================================================
Site N Min Max Mean Median *Stdev Std/Mean Mode
Summary
I don’t see that the data are showing that we are particularly hard on questions — mean, if you would — compared with other sites. I welcome alternate reads of the data.
All data were gathered between 14:00 and 14:30 UTC on Saturday, August 25th, 2012.