The Stan Forums

Topic	Replies	Views	Activity
StanCon 2026 registration and abstract submission are now open! Announcements Hi everyone! Registration for StanCon 2026 in Uppsala, Sweden, is now open! You can already register and submit abstracts for contributions. Our first keynote speaker will be announced soon. New this StanCon: In additi…	1	433	December 11, 2025
Welcome to the Stan Forums! The Stan Forums provide a community for asking and answering questions about all aspects of Stan. Before creating a new topic please search the Forums to see if your questions has already been answered. When posting ne…	3	16082	August 26, 2022
Implementing projection predictive feature selection for custom model with `projpred` General projpred	5	37	February 4, 2026
How to sample a (singular) covariance matrix under compositional constraint Modeling techniques , specification	5	46	February 4, 2026
Doing SBC on restricted gamma distribution Modeling	0	9	February 3, 2026
Proof of concept: Binary output format for cmdstan Developers	46	439	February 3, 2026
Ornstein–Uhlenbeck correlation structure in brms Modeling rstan , brms	0	16	February 3, 2026
Problem in multilevel (hierarchical) multinomial logistic regression (with brms) Modeling brms	11	356	February 3, 2026
Multivariate probit occupancy models Modeling	6	67	February 2, 2026
Modeling noisy indicator of a ratio Modeling specification	2	62	February 2, 2026
'cmath' file not found running brms models on Windows Interfaces fitting-issues	1	113	February 1, 2026
Call for Contributors: Bringing Probabilistic Models & Inference to ONNX Project Proposals	0	37	January 31, 2026
Power analysis for ordinal phylogenetic model brms techniques , brms	1	37	January 31, 2026
Vector Autoregressive Structure brms techniques , brms	3	113	January 31, 2026
Exact, approximate, and minimum count data Modeling techniques , specification	3	93	January 30, 2026
Error when loading premade priors brms brms	0	17	January 30, 2026
Stan Governing Body news Stan Governance	0	60	January 29, 2026
Projpred - model with horseshoe prior does not converge brms	12	1038	January 29, 2026
How to specify weakly informative priors for beta regression with 10 predictors? General techniques , specification	16	224	January 29, 2026
Generating parameter values for a new level in multivariate model with group correlations Modeling techniques , brms	1	44	January 29, 2026
Using the wiener_lpdf() function in the cmdstanr package to implement a diffusion model, the construction of a Markov chain was unsuccessful CmdStan	28	894	January 29, 2026
Do I need a Jacobian to sample from a transfomed unit vector? Modeling	1	54	January 28, 2026
Binomial GLMM Assumptions brms techniques , fitting-issues , stan , hierarchical-model , brms	15	2185	January 28, 2026
StanCon 2026 Tutorials and Workshop deadline today (AoE) Announcements stancon	0	42	January 28, 2026
Error in read_cmdstan_csv Assertion on 'files' failed Developers	11	1509	January 27, 2026
Convergence problems (low E-BFMI, high Rhat and divergent transitions) for ordinal regression using a pR2D2M2ord prior Modeling fitting-issues	4	92	January 27, 2026
Approximate Gaussian process: increase speed and efficiency Modeling cmdstanr , gaussian-process	4	134	January 27, 2026
Shape constrained (e.g., monotonic) smooths in brms brms	6	1398	January 26, 2026
Mechanistic model with stochastic forcing Modeling rstan	0	47	January 26, 2026
Reading into R from cmdstan Interfaces	3	55	January 26, 2026