Topics tagged covariance

Topic	Replies	Views	Activity
Transform sigma values (log) to original scale General covariance , brms	1	40	February 19, 2025
CmdStanPy Variational - How to get density parameters? Modeling techniques , fitting-issues , variational-bayes , covariance , cmdstanpy	10	57	November 19, 2024
Is forcing correlation between parameter values allowed in bayesian regression Modeling fitting-issues , specification , covariance , piecewise , brms	1	73	September 8, 2024
Comparing brms models with unstr() covariance versus cosy() and ar() with loo Modeling loo , covariance , brms , autoregressive-model , time-series	6	94	August 24, 2024
Efficiently populate a matrix in transformed parameters block Modeling matrix , covariance	1	41	July 22, 2024
Complicated variance-covariance matrix not positive definite Modeling covariance , cmdstanr , user-defined-functions	2	181	May 3, 2024
Bivariate model for a meta analysis of diagnostic test accuracy Modeling specification , covariance , meta-analysis	8	1473	February 1, 2024
Covariance issues with Dynamic Factor Model with large N Modeling covariance , time-series	7	558	January 17, 2024
Covariance prior via lkj_corr_cholesky Modeling fitting-issues , covariance	4	495	December 21, 2023
Hierarchical dynamic linear model with rSTAN, problems with fitting a covariance matrix Modeling rstan , fitting-issues , specification , covariance , hierarchical-model	7	1269	October 16, 2023
Covariance between random intercepts Modeling covariance	11	711	July 6, 2023
Non-Centered, Cholesky Factored Covariance Matrix Converges to Inconsistent Parameter Values; Issue with Model Specification? Modeling techniques , specification , covariance , ordinal-response	11	639	August 16, 2022
Non-Centered Cholesky Factor Correlation Matrix Draws Imply Non-Unit Self-Correlation Modeling pystan , techniques , specification , covariance	2	571	July 11, 2022
Comparing Wishart prior against LKJ prior Modeling rstan , covariance , prior-choice , multivariate-normal	5	1325	July 4, 2022
Covariance structures in brms? Modeling covariance	0	1095	April 9, 2022
Conditional multilevel IRT and the level-2 correlation structure brms irt , covariance	4	842	December 22, 2021
Constraining covariance matrix to two parameters (Contemporaneous Correlation) Modeling rstan , performance , covariance	0	749	December 9, 2021
Modeling Multivariate Normal Variance-Covariance Modeling specification , covariance , multivariate-normal	4	723	September 29, 2021
Estimating covariance between fixed and random effects (brms) brms covariance	3	1076	June 11, 2021
Hierarchical model with covariance relationship between parameters: applying different truncations Modeling covariance , truncated , hierarchical-model	10	628	April 18, 2021
Correlation between Gaussian processes Modeling techniques , covariance , gaussian-process	6	1457	March 15, 2021
Gaussian process for parameters that are strictly positive Modeling covariance , gaussian-process	5	1581	March 9, 2021
Hyperparameters on group effects covariance matrix brms covariance , mixed-model	2	687	March 2, 2021
Covariance Matrix Not Symmetric for LKJ prior Modeling fitting-issues , covariance	1	1170	February 22, 2021
Multivariate normal covariance matrix Modeling specification , covariance	5	1041	December 8, 2020
Multivariate normal data covariance estimation Modeling performance , covariance , multivariate-normal	3	1430	May 10, 2020
Initialization Issues with Cholesky Factorization of Covariance Matrix Modeling performance , covariance , prior-choice	1	1000	April 25, 2020
Recommended prior for covariance matrix Modeling covariance , prior-choice	5	6112	December 21, 2017