{"id":825,"date":"2014-01-15T20:32:20","date_gmt":"2014-01-15T19:32:20","guid":{"rendered":"http:\/\/stg-blogs.bmj.com\/adc\/?p=825"},"modified":"2014-01-19T23:29:59","modified_gmt":"2014-01-19T22:29:59","slug":"statsminiblog-regression","status":"publish","type":"post","link":"https:\/\/stg-blogs.bmj.com\/adc\/2014\/01\/15\/statsminiblog-regression\/","title":{"rendered":"StatsMiniBlog. Regression"},"content":{"rendered":"

\"StatsMiniBlog\"<\/a>Now, regression is a bad thing if we’re talking development. It might be any number of really difficult to pronounce neurological conditions, or severe psychological trauma, or abuse\/neglect. It’s not going to be good.<\/p>\n

In statistics, it’s not quite the same. Regression is quite often a good thing. But what is it?<\/p>\n

<\/p>\n

Well, in simple terms it’s drawing a line between one thing and another – like shoe size and height.<\/p>\n

\"\"<\/p>\n

And then using one to predict the other.<\/p>\n

You can make it more complex by trying to predict if something is happening or not (which must be either ‘yes’ – usually 1 – or ‘no’- usually 0). This is most often ‘logistic<\/strong> regression’ (but may also be ‘probit regression’ for reasons which are beyond this mini-blog), and plots the predictor against the probability of the outcome.<\/p>\n

\"\"<\/p>\n

And sometimes you can see if the relationship is different in different groups (e.g. first class vs. coach class, male vs. female when surviving the titanic).\u00a0This is then multivariable<\/strong> regression.<\/p>\n

\"\"<\/p>\n

When you’re looking at the use of these things we need to interpret them sensibly, and like all stats we need to know that it’s not just a data trawl and the appropriate assumptions are met (which is a Masters module in itself …), but you should – hopefully \u00a0– be better able to know what’s going on.<\/p>\n

– Archi<\/p>\n

ps – the last graph here is a great example of the discontinuity we mentioned in our post about before&after studies<\/a><\/p>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

Now, regression is a bad thing if we’re talking development. It might be any number of really difficult to pronounce neurological conditions, or severe psychological trauma, or abuse\/neglect. It’s not going to be good. In statistics, it’s not quite the same. Regression is quite often a good thing. But what is it? […]<\/p>\n

Read More…<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[2676],"tags":[],"class_list":["post-825","post","type-post","status-publish","format-standard","hentry","category-stats"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts\/825","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/comments?post=825"}],"version-history":[{"count":0,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/posts\/825\/revisions"}],"wp:attachment":[{"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/media?parent=825"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/categories?post=825"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/stg-blogs.bmj.com\/adc\/wp-json\/wp\/v2\/tags?post=825"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}