{"id":2465,"date":"2015-10-01T22:24:33","date_gmt":"2015-10-01T20:24:33","guid":{"rendered":"http:\/\/elnostreraco.com\/blog\/?p=2465"},"modified":"2015-10-02T21:55:28","modified_gmt":"2015-10-02T19:55:28","slug":"comparacio-rapida-de-models-de-prediccio-amb-tableau-public","status":"publish","type":"post","link":"https:\/\/elnostreraco.com\/blog\/comparacio-rapida-de-models-de-prediccio-amb-tableau-public\/","title":{"rendered":"Comparaci\u00f3 r\u00e0pida de models de predicci\u00f3 amb Tableau Public"},"content":{"rendered":"<p>En aquest blog he publicat articles sobre Infer\u00e8ncia en regressions lineals sobre <a href=\"http:\/\/elnostreraco.com\/blog\/analytics\/inferencia-en-regressions-lineals-els-anys-i-els-parats\/\">parats per trimestre<\/a> i <a href=\"http:\/\/elnostreraco.com\/blog\/analytics\/inferencia-en-regresions-lineals-les-visites-i-els-enllacos\/\">visites segons enlla\u00e7os<\/a>\u00a0en qu\u00e8 he utilitzat Rstudio.<\/p>\n<p>Una manera r\u00e0pida de visualitzar models de predicci\u00f3 \u00e9s utilitzar eines com Tableau Desktop o\u00a0<a href=\"https:\/\/public.tableau.com\/s\/\">Tableau Public<\/a>.<\/p>\n<p>Aqu\u00ed teniu la predicci\u00f3 de disminuci\u00f3 de parats:<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-2466\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/epa-trends-1024x538.png?resize=660%2C347\" alt=\"epa-trends\" width=\"660\" height=\"347\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/epa-trends.png?resize=1024%2C538&amp;ssl=1 1024w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/epa-trends.png?resize=300%2C158&amp;ssl=1 300w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/epa-trends.png?w=1152&amp;ssl=1 1152w\" sizes=\"auto, (max-width: 660px) 100vw, 660px\" \/><\/p>\n<p>Amb el bot\u00f3 contextual podeu veure la descripci\u00f3 del model:<img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2467\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/describe-trend.png?resize=750%2C377\" alt=\"describe-trend\" width=\"750\" height=\"377\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/describe-trend.png?w=829&amp;ssl=1 829w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/describe-trend.png?resize=300%2C151&amp;ssl=1 300w\" sizes=\"auto, (max-width: 750px) 100vw, 750px\" \/><\/p>\n<p>T\u00e9 significan\u00e7a estad\u00edstica\u00a0(p-value \u00a0menor de 0,05) i \u00e9s un model representatiu (R-squared=0,987).<\/p>\n<p><script type='text\/javascript' src='https:\/\/public.tableau.com\/javascripts\/api\/viz_v1.js'><\/script><\/p>\n<div class='tableauPlaceholder' style='width: 599px; height: 742px;'><noscript><a href='#'><img data-recalc-dims=\"1\" alt='Sheet 1 ' src=\"https:\/\/i0.wp.com\/public.tableau.com\/static\/images\/Te\/Test1_642\/Sheet1\/1_rss.png?w=750&#038;ssl=1\" style='border: none' \/><\/a><\/noscript><object class='tableauViz' width='599' height='742' style='display:none;'><param name='host_url' value='https%3A%2F%2Fpublic.tableau.com%2F' \/><param name='site_root' value='' \/><param name='name' value='Test1_642&#47;Sheet1' \/><param name='tabs' value='no' \/><param name='toolbar' value='yes' \/><param name='static_image' value='https:&#47;&#47;public.tableau.com&#47;static&#47;images&#47;Te&#47;Test1_642&#47;Sheet1&#47;1.png' \/><param name='animate_transition' value='yes' \/><param name='display_static_image' value='yes' \/><param name='display_spinner' value='yes' \/><param name='display_overlay' value='yes' \/><param name='display_count' value='yes' \/><param name='showVizHome' value='no' \/><param name='showTabs' value='y' \/><param name='bootstrapWhenNotified' value='true' \/><\/object><\/div>\n<p>L&#8217;altre exemple era la predicci\u00f3 d&#8217;enlla\u00e7os que explicarien 2 milions de visites. En aquest cas us mostro 3 possibles models:<\/p>\n<p>Una explicaci\u00f3 amb un model lineal<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2468\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-lineal.png?resize=571%2C465\" alt=\"links-lineal\" width=\"571\" height=\"465\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-lineal.png?w=571&amp;ssl=1 571w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-lineal.png?resize=300%2C244&amp;ssl=1 300w\" sizes=\"auto, (max-width: 571px) 100vw, 571px\" \/><\/p>\n<p>Una explicaci\u00f3 amb un model logar\u00edtmic<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2469\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-log.png?resize=570%2C467\" alt=\"links-log\" width=\"570\" height=\"467\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-log.png?w=570&amp;ssl=1 570w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-log.png?resize=300%2C246&amp;ssl=1 300w\" sizes=\"auto, (max-width: 570px) 100vw, 570px\" \/><\/p>\n<p>I una explicaci\u00f3 amb un model exponencial:<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2470\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-exp.png?resize=621%2C468\" alt=\"links-exp\" width=\"621\" height=\"468\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-exp.png?w=621&amp;ssl=1 621w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/links-exp.png?resize=300%2C226&amp;ssl=1 300w\" sizes=\"auto, (max-width: 621px) 100vw, 621px\" \/><\/p>\n<p>Comparaci\u00f3 de R-Squared:<\/p>\n<ul>\n<li>Lineal: 0,899515<\/li>\n<li>Logar\u00edtmic:\u00a00,734304<\/li>\n<li>Exponencial:\u00a00,786793<\/li>\n<\/ul>\n<p>Amb aquestes dades, el model que m\u00e9s ens quadra \u00e9s el model lineal.<\/p>\n<p>\u00a0 Tornem a la situaci\u00f3. Qu\u00e8 us diu el sentit com\u00fa? <\/p>\n<blockquote class=\"twitter-tweet\" lang=\"ca\">\n<p>Data is the new science. To get answers big data is not enough. You need total population or you need to focus on representative data sets.<\/p>\n<p>\u2014 Jordi Rosell (@jrosell) <a href=\"https:\/\/twitter.com\/jrosell\/status\/646219369639452672\">September 22, 2015<\/a>\n<\/p><\/blockquote>\n<p><script src=\"\/\/platform.twitter.com\/widgets.js\" async=\"\" charset=\"utf-8\"><\/script><\/p>\n<p>Hem d&#8217;assumir que hi\u00a0ha diferents punts de vista.<\/p>\n<p><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2479\" src=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/BKNWtB_CcAA4m40.jpg?resize=599%2C409\" alt=\"BKNWtB_CcAA4m40\" width=\"599\" height=\"409\" srcset=\"https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/BKNWtB_CcAA4m40.jpg?w=599&amp;ssl=1 599w, https:\/\/i0.wp.com\/elnostreraco.com\/blog\/wp-content\/uploads\/BKNWtB_CcAA4m40.jpg?resize=300%2C205&amp;ssl=1 300w\" sizes=\"auto, (max-width: 599px) 100vw, 599px\" \/><\/p>\n<p>&nbsp;<\/p>\n<p>Bona sort i feli\u00e7\u00a0an\u00e0lisi de dades!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En aquest blog he publicat articles sobre Infer\u00e8ncia en regressions lineals sobre parats per trimestre i visites segons enlla\u00e7os\u00a0en qu\u00e8 he utilitzat Rstudio. Una manera r\u00e0pida de visualitzar models de predicci\u00f3 \u00e9s utilitzar eines com &hellip; <\/p>\n","protected":false},"author":1,"featured_media":2479,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","jetpack_post_was_ever_published":false},"categories":[15],"tags":[],"class_list":["post-2465","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Comparaci\u00f3 r\u00e0pida de models de predicci\u00f3 amb Tableau Public ~ Anal\u00edtica<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/elnostreraco.com\/blog\/comparacio-rapida-de-models-de-prediccio-amb-tableau-public\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Comparaci\u00f3 r\u00e0pida de models de predicci\u00f3 amb Tableau Public ~ Anal\u00edtica\" \/>\n<meta property=\"og:description\" content=\"En aquest blog he publicat articles sobre Infer\u00e8ncia en regressions lineals sobre parats per trimestre i visites segons enlla\u00e7os\u00a0en qu\u00e8 he utilitzat Rstudio. 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