{"id":1903,"date":"2018-01-31T16:55:37","date_gmt":"2018-01-31T17:55:37","guid":{"rendered":"http:\/\/sites.uac.pt\/amendes\/?p=1903"},"modified":"2018-01-31T16:55:37","modified_gmt":"2018-01-31T17:55:37","slug":"variable-reduction","status":"publish","type":"post","link":"https:\/\/sites.uac.pt\/amendes\/estatistica\/variable-reduction\/","title":{"rendered":"When Variable Reduction Doesn\u2019t Work"},"content":{"rendered":"<div id=\"attachment_1083\" style=\"width: 310px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.datasciencecentral.com\/profiles\/blogs\/when-variable-reduction-doesn-t-work\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1083\" class=\"size-medium wp-image-1083\" src=\"http:\/\/sites.uac.pt\/amendes\/files\/2013\/10\/dataScience-300x54.png\" alt=\"clique na imagem para seguir o link\" width=\"300\" height=\"54\" srcset=\"https:\/\/sites.uac.pt\/amendes\/files\/2013\/10\/dataScience-300x54.png 300w, https:\/\/sites.uac.pt\/amendes\/files\/2013\/10\/dataScience.png 657w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><p id=\"caption-attachment-1083\" class=\"wp-caption-text\">clique na imagem para seguir o link<\/p><\/div>\n<p><span style=\"color: #ff0000\">Um bom exemplo de como os procedimentos habituais nem sempre funcionam<\/span><\/p>\n<p><strong><em>Summary:<\/em><\/strong><em> Exceptions sometimes make the best rules.\u00a0 Here\u2019s an example of well accepted variable reduction techniques resulting in an inferior model and a case for dramatically expanding the number of variables we start with.<\/em><\/p>\n<p><span> <\/span><\/p>\n<p><span> <\/span>of the things that keeps us data scientists on our toes is that the well-established rules-of-thumb don\u2019t always work.\u00a0 Certainly one of the most well-worn of these rules is the parsimonious model; always seek to create the best model with the fewest variables.\u00a0 And woe to you who violate this rule.\u00a0 Your model will over fit, include false random correlations, or at very least will just be judged to be slow and clunky.<span> <\/span><\/p>\n<p>Certainly this is a rule I embrace when building models so I was surprised and then delighted to find a well conducted study by Lexis\/Nexis that lays out a case where this clearly isn\u2019t true.<\/p>\n<p><span> <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Um bom exemplo de como os procedimentos habituais nem sempre funcionam Summary: Exceptions sometimes make the best rules.\u00a0 Here\u2019s an example of well accepted variable reduction techniques resulting in an inferior model and a case for dramatically expanding the number of variables we start with. of the things that keeps us data scientists on our [&hellip;]<\/p>\n","protected":false},"author":159,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[103,102,150],"tags":[112],"class_list":["post-1903","post","type-post","status-publish","format-standard","hentry","category-data-mining","category-estatistica","category-materiais-para-profissionais","tag-problemas"],"_links":{"self":[{"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/posts\/1903","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/users\/159"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/comments?post=1903"}],"version-history":[{"count":2,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/posts\/1903\/revisions"}],"predecessor-version":[{"id":1905,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/posts\/1903\/revisions\/1905"}],"wp:attachment":[{"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/media?parent=1903"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/categories?post=1903"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.uac.pt\/amendes\/wp-json\/wp\/v2\/tags?post=1903"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}