{"action":"opened","issue":{"url":"https://api.github.com/repos/WetRobot/popEpi/issues/107","repository_url":"https://api.github.com/repos/WetRobot/popEpi","labels_url":"https://api.github.com/repos/WetRobot/popEpi/issues/107/labels{/name}","comments_url":"https://api.github.com/repos/WetRobot/popEpi/issues/107/comments","events_url":"https://api.github.com/repos/WetRobot/popEpi/issues/107/events","html_url":"https://github.com/WetRobot/popEpi/issues/107","id":158658742,"number":107,"title":"ltable doesn't display NA levels","user":{"login":"mattirantanen","id":10721213,"avatar_url":"https://avatars.githubusercontent.com/u/10721213?v=3","gravatar_id":"","url":"https://api.github.com/users/mattirantanen","html_url":"https://github.com/mattirantanen","followers_url":"https://api.github.com/users/mattirantanen/followers","following_url":"https://api.github.com/users/mattirantanen/following{/other_user}","gists_url":"https://api.github.com/users/mattirantanen/gists{/gist_id}","starred_url":"https://api.github.com/users/mattirantanen/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mattirantanen/subscriptions","organizations_url":"https://api.github.com/users/mattirantanen/orgs","repos_url":"https://api.github.com/users/mattirantanen/repos","events_url":"https://api.github.com/users/mattirantanen/events{/privacy}","received_events_url":"https://api.github.com/users/mattirantanen/received_events","type":"User","site_admin":false},"labels":[{"url":"https://api.github.com/repos/WetRobot/popEpi/labels/bug","name":"bug","color":"fc2929"}],"state":"open","locked":false,"assignee":{"login":"WetRobot","id":11218767,"avatar_url":"https://avatars.githubusercontent.com/u/11218767?v=3","gravatar_id":"","url":"https://api.github.com/users/WetRobot","html_url":"https://github.com/WetRobot","followers_url":"https://api.github.com/users/WetRobot/followers","following_url":"https://api.github.com/users/WetRobot/following{/other_user}","gists_url":"https://api.github.com/users/WetRobot/gists{/gist_id}","starred_url":"https://api.github.com/users/WetRobot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/WetRobot/subscriptions","organizations_url":"https://api.github.com/users/WetRobot/orgs","repos_url":"https://api.github.com/users/WetRobot/repos","events_url":"https://api.github.com/users/WetRobot/events{/privacy}","received_events_url":"https://api.github.com/users/WetRobot/received_events","type":"User","site_admin":false},"milestone":{"url":"https://api.github.com/repos/WetRobot/popEpi/milestones/4","html_url":"https://github.com/WetRobot/popEpi/milestones/V.%200.4.0","labels_url":"https://api.github.com/repos/WetRobot/popEpi/milestones/4/labels","id":1639344,"number":4,"title":"V. 0.4.0","description":"","creator":{"login":"WetRobot","id":11218767,"avatar_url":"https://avatars.githubusercontent.com/u/11218767?v=3","gravatar_id":"","url":"https://api.github.com/users/WetRobot","html_url":"https://github.com/WetRobot","followers_url":"https://api.github.com/users/WetRobot/followers","following_url":"https://api.github.com/users/WetRobot/following{/other_user}","gists_url":"https://api.github.com/users/WetRobot/gists{/gist_id}","starred_url":"https://api.github.com/users/WetRobot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/WetRobot/subscriptions","organizations_url":"https://api.github.com/users/WetRobot/orgs","repos_url":"https://api.github.com/users/WetRobot/repos","events_url":"https://api.github.com/users/WetRobot/events{/privacy}","received_events_url":"https://api.github.com/users/WetRobot/received_events","type":"User","site_admin":false},"open_issues":13,"closed_issues":4,"state":"open","created_at":"2016-03-11T17:34:30Z","updated_at":"2016-06-06T11:43:53Z","due_on":null,"closed_at":null},"comments":0,"created_at":"2016-06-06T11:43:53Z","updated_at":"2016-06-06T11:43:53Z","closed_at":null,"body":"the following code should return also the combinations that includes NA's:\r\n\r\n```r\r\n> dt <- data.table(a = c(NA,1,2), b=c(1,1,2))\r\n> ltable(dt, by=c('a','b'))\r\n   a b obs\r\n1: 1 1   1\r\n2: 1 2   0\r\n3: 2 1   0\r\n4: 2 2   1\r\n```"}}
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