ECHOExploratory Compendium of Humanity Online

Stack Exchange — scicomp.stackexchange.com

AnalyzedSmallgraphtextStack ExchangeAcademicEngagementKnowledge sharingQ&ASocial graphSoftware development

A Stack Exchange (scicomp.stackexchange.com) dataset of 5,509 users, 11,287 answer-collaboration edges, 11,336 questions, 13,817 answers, collected by Stack Exchange, Inc. via the annual Stack Exchange Data Dump. Each record contains user nodes (reputation, badge counts, vote history), directed weighted edges (answerer→asker, weight=answer score, count=interactions, accepted=bool), post text, tag distribution. User collaboration network from scicomp.stackexchange.com — directed weighted graph where edges represent knowledge-sharing relationships (A answered B's question), with edge weight reflecting answer quality. Enables prestige hierarchy, community detection, and expertise flow analysis.. Suitable for expertise network analysis, reputation systems, community detection, knowledge flow, PageRank-based authority ranking, Q&A platform dynamics..

#Expertise network#Reputation#Scientific computing#Stack exchange data dump

Cite this dataset at stackexchange-scicomp-stackexchange-com.echo.directory

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Analytics

The interactive network needs JavaScript.

· graph.json

The full graph has 5,509 nodes; this view shows the 1,000-node sample the pipeline drew for display. Node size is centrality, colour is community.

5.5K
Nodes
11.3K
Edges
3.72e-04
Density
108
Components
-0.1016
Assortativity
1.1%
Reciprocity
3K
Bridges
Most central nodes
5490.01507
1230.01307
2760.01053
5290.00835
81380.00763
1640.00744
33040.00726
9880.0069
1030.00672
2380.00654
Content metrics

25,153 records scored · min–maxmean ± 0.675 σ (the interquartile range if the values are roughly normal)mean

scoreμ 3.52 ± 5.029
min -6max 170
view countμ 490.906 ± 2.6K
min 0max 140.1K
answer countμ 0.549 ± 1.009
min 0max 23
comment countμ 2.134 ± 2.823
min 0max 62
10.9
Flesch–Kincaid grade
US school grade level
12.2
Automated readability index
Frequent terms
ampfracmatrixproblemusetimepartialmethodfunctionendequationrightsolutionlikemathbfcodequotleftdeltasolvepointordermethodssystemlinearneednumberwantquestionbeginboundarywayerrorcaseknowdatafindexamplefinitealgorithmpointsequationsvectorstepvaluesnumericalvaluedondoubledifferent
Topic clusters

Topic 0

optimization
problem
constraint
function
convex
objective
gradient
variable

Topic 1

gpu
memory
mpi
core
performance
run
cpu
parallel

Topic 2

code
fortran
language
computational
python
scientific
write
science

Topic 3

mesh
triangle
point
edge
cell
face
vertex
element

Topic 4

boundary
condition
pde
equation
solution
neumann
dirichlet
solve

Topic 5

precision
float
number
error
double
arithmetic
function
point

Topic 6

energy
particle
atom
molecule
simulation
molecular
potential
time

Topic 7

point
fourier
interpolation
function
polynomial
image
transform
spline

Topic 8

ode
method
time
step
equation
system
order
solve

Topic 9

element
finite
function
method
fem
basis
stiffness
solution

Topic 10

eigenvalue
eigenvector
matrix
symmetric
large
compute
positive
small

Topic 11

matrix
sparse
int
lapack
blas
row
column
factorization
Show all 19 topics

Topic 12

integral
quadrature
integration
function
integrand
rule
integrate
monte

Topic 13

flow
pressure
stokes
velocity
navier
boundary
fluid
equation

Topic 14

plot
datum
paraview
file
vtk
matplotlib
visualization
python

Topic 15

diffusion
equation
advection
scheme
upwind
method
term
numerical

Topic 16

multigrid
preconditioner
krylov
method
grid
matrix
coarse
gmres

Topic 17

amp
matrix
solve
problem
system
equation
form
linear

Topic 18

petsc
redhat
lib
gcc
complex
error
matrix
declaration
Top hashtags
#include836
#39243
#1235
#define175
#297
#pragma89
#print71
#endif54
#plt50
#mtkarg40
#if36
#mtiipvar34
#sjfw500r31
#number29
#plot27
#boundary26
#the26
#set24
#323
#else23

Sampled: text metrics from 50K of 90.9K records; topic model from 20K.

Record

Catalog key
stackexchange-scicomp-stackexchange-com
Authors
Stack Exchange, Inc.
Year
2025
Source paper
Stack Exchange Data Dump
License
CC BY-SA 2.5 / 3.0 / 4.0 (by post date) (CC-BY-SA-2.5 AND CC-BY-SA-3.0 AND CC-BY-SA-4.0)
Records
90,868
Nodes
5,509
Edges
11,287 (directed)
Nodes are
user (Stack Exchange account)
Edges are
answer collaboration (A answered B's question)
Attributes
nodes have attributes; edges have attributes
Text corpus
question titles, post bodies, comment text, tag names
Languages
en
Collected
2011/2024 (2010s, 2020s)
Tasks
From the graph: link prediction, community detection
Region
Global (inferred: the platform is used worldwide)

Provenance

Originally published at
https://archive.org/download/stackexchange link checked
Hosted copy
Mirrored on echo.directory on 2026-10-09, 35.7 MB across 1 files. Checksums in MANIFEST.json.

How to cite

BibTeX

@misc{echo2026,
  title  = {ECHO: Exploratory Compendium of Humanity Online},
  author = {Switzer, Braden and Zafarani, Reza},
  year   = {2026},
  url    = {https://echo.directory},
  note   = {Syracuse University}
}

@misc{stackexchange_2025,
  title     = {Stack Exchange Data Dump},
  author    = {{Stack Exchange, Inc.}},
  year      = {2025},
  publisher = {Internet Archive},
  url       = {https://archive.org/download/stackexchange}
}

APA

Switzer, B., & Zafarani, R. (2026). ECHO: Exploratory Compendium of Humanity Online [Data repository]. Syracuse University. https://echo.directory

Stack Exchange, Inc. (2025). Stack Exchange — scicomp.stackexchange.com [Data set]. https://stackexchange-scicomp-stackexchange-com.echo.directory/

MLA

Switzer, Braden, and Reza Zafarani. ECHO: Exploratory Compendium of Humanity Online. Syracuse University, 2026, echo.directory.

Stack Exchange, Inc. Stack Exchange — scicomp.stackexchange.com. 2025, stackexchange-scicomp-stackexchange-com.echo.directory/.

BibTeX · RIS · CSL-JSON

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