stan-dev/stan

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Stan development repository. The master branch contains the current release. The develop branch contains the latest stable development. See the Developer Process Wiki for details.

Stars: 2.8k
Forks: 388
Open beginner issues: 0
Indexed issues: 137
Avg merge: 2d 17h
Merged PRs (30d): 15

Dominant language: C++
License: BSD-3-Clause
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: good first issue help wanted

Beginner friendly Everything

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137 open issues indexed

vb crash on Windows Open

bug windows

stan-dev/stan#1758 · 11 comments · 1 assignee · Opened Jan 22, 2016
vector-output log density functions Open

feature

stan-dev/stan#1697 · 4 comments · 1 assignee · Opened Nov 19, 2015
Remove unused variational::base_family class Open

code cleanup good first issue

stan-dev/stan#1695 · 6 comments · 1 assignee · Opened Nov 19, 2015
advi should output samples at last iteration after being interrupted (ctrl-c) Open

feature

stan-dev/stan#1663 · 6 comments · 2 assignees · Opened Nov 3, 2015
advi should output mean parameters as a commented line in csv Open

stan-dev/stan#1661 · 1 assignee · Opened Nov 2, 2015
Print exceptions on one line Open

code cleanup

stan-dev/stan#1580 · 1 comment · 2 assignees · Opened Aug 9, 2015
Refactor stochastic gradient things in ADVI Open

algorithm feature

stan-dev/stan#1575 · 2 comments · 2 assignees · Opened Jul 31, 2015
Mean and count priors parameterizations for Beta and Dirichlet Open

feature new function

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/stan#1563 · 1 comment · Opened Jul 22, 2015
trap improper posteriors Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/stan#1555 · 2 comments · Opened Jul 19, 2015
Refactor write_iteration* functions Open

code cleanup

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/stan#1538 · 10 comments · Opened Jul 10, 2015
more general gamma function Open

feature new function

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#1536 · 19 comments · Opened Jul 10, 2015
Generic Dosing Mechanism Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#1454 · Opened May 21, 2015
relocate stan/lang/rethrow_located.hpp Open

code cleanup

stan-dev/stan#1448 · 1 assignee · Opened May 12, 2015
ragged array assignment (not declaration) Open

feature language

stan-dev/stan#1369 · 43 comments · 1 assignee · Opened Mar 14, 2015
functionality in chains for correlation Open

feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/stan#1346 · Opened Mar 7, 2015
Enable optimization within .stan programs Open

feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#1319 · 4 comments · Opened Feb 28, 2015
buffering CSV output Open

code cleanup feature i/o

stan-dev/stan#1264 · 1 assignee · Opened Feb 4, 2015
add namespaces to test utility functions Open

code cleanup

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stan-dev/stan#1252 · Opened Jan 28, 2015
instantiate 2nd and 3rd order derivatives for the test models Open

testing

stan-dev/stan#1189 · 1 comment · 1 assignee · Opened Dec 28, 2014
access to iteration number and chain id within model Open

feature language

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#1166 · 11 comments · Opened Dec 10, 2014
interval CDF differences for interval censoring/truncation Open

feature new function

Difficulty 3/5 1-2 days Newbie friendliness 35/100

stan-dev/stan#1154 · 2 comments · 1 reaction · Opened Dec 4, 2014
diagnostic mode without Jacobian Open

algorithm feature

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/stan#1084 · 1 comment · Opened Oct 19, 2014
Add common interface tests for minimum required functionality Open

interface testing

stan-dev/stan#833 · 1 comment · 1 assignee · Opened Aug 8, 2014
classify functions for numerical instability Open

documentation feature

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#801 · 4 comments · Opened Jul 24, 2014
generalize model_functional and rename to model_functor Open

code cleanup feature

Difficulty 4/5 3-5 days Newbie friendliness 35/100

stan-dev/stan#797 · Opened Jul 23, 2014
remove "error", "exception", "warning" from what we report Open

code cleanup

stan-dev/stan#752 · 5 comments · 1 reaction · 1 assignee · Opened Jul 8, 2014
Breakup the Model Tests Open

testing

stan-dev/stan#700 · 1 comment · 2 assignees · Opened Jun 19, 2014
missing data I/O and imputation / partial data structures Open

feature interface language new function project

Difficulty 5/5 Over a week Newbie friendliness 20/100

stan-dev/stan#646 · 14 comments · Opened May 12, 2014
make sure all distributions throw exceptions at undefined boundaries Open

code cleanup documentation

stan-dev/stan#603 · 1 comment · 2 assignees · Opened Mar 13, 2014
vectorize Jacobians in transforms Open

code cleanup feature

stan-dev/stan#524 · 2 comments · 1 assignee · Opened Jan 30, 2014
Fix stan_csv_reader and test Open

bug code cleanup i/o interface

Difficulty 5/5 Over a week Newbie friendliness 25/100

stan-dev/stan#507 · 9 comments · Opened Jan 20, 2014
naturally parameterized multivariate normal Open

feature language new function

Difficulty 4/5 3-5 days Newbie friendliness 30/100

stan-dev/stan#482 · 13 comments · Opened Jan 3, 2014
structured mass matrices Open

feature project

Difficulty 5/5 Over a week Newbie friendliness 15/100

stan-dev/stan#426 · 3 comments · Opened Nov 30, 2013
optimizer test framework Open

stan-dev/stan#320 · 1 comment · 1 assignee · Opened Oct 23, 2013
sampler testing framework Open

feature project testing

stan-dev/stan#318 · 6 comments · 1 assignee · Opened Oct 23, 2013
softmax, categorical, multinomial with K-1 parameters for identifiability Open

feature language project

stan-dev/stan#266 · 11 comments · 1 reaction · 1 assignee · Opened Oct 8, 2013
optimization testing Open

feature interface testing

Difficulty 4/5 3-5 days Newbie friendliness 25/100

stan-dev/stan#262 · 1 comment · Opened Oct 7, 2013

stan-dev/stan

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