{"action":"closed","issue":{"url":"https://api.github.com/repos/paul-buerkner/brms/issues/91","repository_url":"https://api.github.com/repos/paul-buerkner/brms","labels_url":"https://api.github.com/repos/paul-buerkner/brms/issues/91/labels{/name}","comments_url":"https://api.github.com/repos/paul-buerkner/brms/issues/91/comments","events_url":"https://api.github.com/repos/paul-buerkner/brms/issues/91/events","html_url":"https://github.com/paul-buerkner/brms/issues/91","id":162316901,"number":91,"title":"Create new syntax to specify correlations of group-level effects across formulae","user":{"login":"paul-buerkner","id":12938496,"avatar_url":"https://avatars.githubusercontent.com/u/12938496?v=3","gravatar_id":"","url":"https://api.github.com/users/paul-buerkner","html_url":"https://github.com/paul-buerkner","followers_url":"https://api.github.com/users/paul-buerkner/followers","following_url":"https://api.github.com/users/paul-buerkner/following{/other_user}","gists_url":"https://api.github.com/users/paul-buerkner/gists{/gist_id}","starred_url":"https://api.github.com/users/paul-buerkner/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/paul-buerkner/subscriptions","organizations_url":"https://api.github.com/users/paul-buerkner/orgs","repos_url":"https://api.github.com/users/paul-buerkner/repos","events_url":"https://api.github.com/users/paul-buerkner/events{/privacy}","received_events_url":"https://api.github.com/users/paul-buerkner/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/paul-buerkner/brms/labels/feature","name":"feature","color":"207de5"}],"state":"closed","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":0,"created_at":"2016-06-26T07:49:27Z","updated_at":"2016-08-15T21:26:13Z","closed_at":"2016-08-15T21:26:13Z","body":"At the moment, group-level ('random') effects of different non-linear parameters cannot be modeled as correlated, although this is often useful. \r\n\r\nIn addition, the 'multivariate' syntax applied among others in zero-inflated / hurdle models as well as in categorical models exists only to specify group-level correlations across different model parts. However, users frequently stumble across this syntax and end up fitting models that they didn't want to fit.\r\n\r\nThus, a new syntax element is needed extending `lme4` syntax that allows specifying these correlations across multiple formulae. As this will be a huge change that might also break backwards compatibility, I think it should be part of `brms` version 1.0."}}
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