{"id":2564,"date":"2016-06-22T13:58:15","date_gmt":"2016-06-22T11:58:15","guid":{"rendered":"http:\/\/elnostreraco.com\/blog\/?p=2564"},"modified":"2017-01-10T12:11:28","modified_gmt":"2017-01-10T10:11:28","slug":"visualitzacio-dades-comencament-eix-y","status":"publish","type":"post","link":"https:\/\/elnostreraco.com\/blog\/visualitzacio-dades-comencament-eix-y\/","title":{"rendered":"Valor per on comen\u00e7a l&#8217;eix &#8220;y&#8221; en la visualitzaci\u00f3 de dades"},"content":{"rendered":"<p><strong>No indicar per quin valor comen\u00e7a\u00a0l&#8217;eix &#8220;y&#8221; quan comen\u00e7a per un valor diferent de 0 \u00e9s manipular. Si no \u00e9s 0 i l&#8217;indiques \u00e9s explicar una hist\u00f2ria.<\/strong><br \/>\n<!--more--><br \/>\nVisualitzaci\u00f3 de dades. Quin gran tema dins de l&#8217;<a href=\"http:\/\/elnostreraco.com\/blog\/analytics\/\">anal\u00edtica web<\/a>. Aqu\u00ed us presento\u00a0un exemple per parlar-ne.<\/p>\n<h2>Visualitzaci\u00f3 de la despesa social<\/h2>\n<p>Pablo Casado, representant del PP en el <a href=\"http:\/\/www.eldiario.es\/politica\/PP-manipula-grafico-presumir-social_0_529147081.html\">debat a set de TVE<\/a>, mostra un gr\u00e0fic (1:08:20) que pret\u00e9n indicar l&#8217;evoluci\u00f3 de la despesa social en els governs de Mariano Rajoy fins al 2016\u00a0per\u00f2 la dada del 2013 \u00e9s m\u00e9s alta que la 2014 per\u00f2 a la infografia mostrada el 2014 sembla m\u00e9s gran.<\/p>\n<figure id=\"attachment_2565\" aria-describedby=\"caption-attachment-2565\" style=\"width: 476px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2565 size-full\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-social.jpg\" alt=\"gasto-social\" width=\"476\" height=\"249\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-social.jpg 476w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-social-300x157.jpg 300w\" sizes=\"auto, (max-width: 476px) 100vw, 476px\" \/><figcaption id=\"caption-attachment-2565\" class=\"wp-caption-text\">Pablo Casado: &#8220;Tanto mentir al final se topa, no con un meme, con la realidad&#8221;<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<p>Mirem\u00a0el detall,\u00a0<strong>les mides no corresponen als n\u00fameros<\/strong><\/p>\n<figure id=\"attachment_2567\" aria-describedby=\"caption-attachment-2567\" style=\"width: 238px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2567 size-medium\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/diferencia-e1466580700109-238x300.jpg\" alt=\"diferencia\" width=\"238\" height=\"300\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/diferencia-e1466580700109-238x300.jpg 238w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/diferencia-e1466580700109.jpg 578w\" sizes=\"auto, (max-width: 238px) 100vw, 238px\" \/><figcaption id=\"caption-attachment-2567\" class=\"wp-caption-text\">Albano-Dante Fachin \u200f@AlbanoDante76 &#8220;No pueden parar de manipular.&#8221;<\/figcaption><\/figure>\n<p>Al compte oficial de\u00a0twitter del PP veiem que <strong>no s&#8217;indica quin \u00e9s el valor per on comen\u00e7a l&#8217;eix &#8220;y&#8221;:<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2568\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-socia-info-1.jpg\" alt=\"gasto-socia-info\" width=\"723\" height=\"832\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-socia-info-1.jpg 723w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/gasto-socia-info-1-261x300.jpg 261w\" sizes=\"auto, (max-width: 723px) 100vw, 723px\" \/><\/p>\n<p>Fer-lo comen\u00e7ar per un valor diferent de zero no \u00e9s tan barroer com l&#8217;error anterior. Es pot considerar, com diria Gabriel Rufi\u00e1n, candidat d&#8217;ERC tamb\u00e9 present en el debat, &#8220;primero de manipulaci\u00f3n&#8221;.<\/p>\n<p>El llibre &#8220;Lie with statistics&#8221; de\u00a0Darrell Huff va popularitzar el perill\u00a0de no mostrar per quin valor comen\u00e7a l&#8217;eix &#8220;y&#8221;.<\/p>\n<p><iframe loading=\"lazy\" style=\"width: 120px; height: 240px;\" src=\"\/\/rcm-eu.amazon-adsystem.com\/e\/cm?lt1=_blank&amp;bc1=FFFFFF&amp;IS2=1&amp;bg1=FFFFFF&amp;fc1=000000&amp;lc1=0000FF&amp;t=elnostraco-21&amp;o=30&amp;p=8&amp;l=as4&amp;m=amazon&amp;f=ifr&amp;ref=as_ss_li_til&amp;asins=0393310728&amp;linkId=a4971ce726440d5d2c99327918ec1ad7\" width=\"300\" height=\"150\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>Agafant les mateixes dades, he vist gent que hi ha qui ha compartit <strong>gr\u00e0fics comen\u00e7ant l&#8217;eix &#8220;y&#8221; per 0<\/strong>\u00a0similar\u00a0a aquest:<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2569\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/zero.png\" alt=\"zero\" width=\"582\" height=\"416\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/zero.png 582w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/zero-300x214.png 300w\" sizes=\"auto, (max-width: 582px) 100vw, 582px\" \/><\/p>\n<p>Si l&#8217;eix &#8220;y&#8221; no comen\u00e7a per 0,\u00a0<a href=\"https:\/\/www.youtube.com\/watch?v=14VYnFhBKcY\">hi ha qui es queixa immediatament<\/a>, per\u00f2 com veieu, el gr\u00e0fic no distingeix gran cosa.<\/p>\n<figure id=\"attachment_2595\" aria-describedby=\"caption-attachment-2595\" style=\"width: 709px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-2595 size-full\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/baseline-2.png\" alt=\"baseline\" width=\"709\" height=\"255\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/baseline-2.png 709w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/baseline-2-300x108.png 300w\" sizes=\"auto, (max-width: 709px) 100vw, 709px\" \/><figcaption id=\"caption-attachment-2595\" class=\"wp-caption-text\">Utilitza una base que mostri les dades, no per 0<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n<blockquote><p><em>[Actualitzaci<\/em>\u00f3]<\/p>\n<p>Les xifres no s\u00f3n correctes. La despesa social hauria d&#8217;incloure &#8220;Educaci\u00f3n&#8221; i &#8220;Sanidad&#8221;\u00a0per\u00f2 nom\u00e9s inclouen la despesa de &#8220;Protecci\u00f3n social&#8221;.<\/p>\n<p>I caldria puntualitzar que de dades oficials confirmades nom\u00e9s tenim fins al\u00a02013. Les del 2014 s\u00f3n provisionals i les del 2015 i 2016 s\u00f3n estimacions\u00a0pr\u00f2pies del ministeri.<\/p>\n<p>Podeu veure les dades aqu\u00ed\u00a0<a href=\"http:\/\/elboenuestrodecadadia.com\/2016\/06\/21\/el-pp-no-solo-manipulo-el-grafico-mintio-el-gasto-social-no-ha-subido\/\">http:\/\/elboenuestrodecadadia.com\/2016\/06\/21\/el-pp-no-solo-manipulo-el-grafico-mintio-el-gasto-social-no-ha-subido\/<\/a><\/p>\n<p><em>[Fi de l&#8217;actualitzaci\u00f3]<\/em><\/p><\/blockquote>\n<h2>Com mostrem en\u00a0un gr\u00e0fic l&#8217;evoluci\u00f3 de la despesa social amb quantitats altes?<\/h2>\n<p>&#8220;A por ello&#8221;<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-2587 size-medium\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/Challenge-Accepted-Meme-300x188.jpg\" alt=\"Challenge-Accepted-Meme\" width=\"300\" height=\"188\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/Challenge-Accepted-Meme-300x188.jpg 300w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/Challenge-Accepted-Meme-768x480.jpg 768w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/Challenge-Accepted-Meme-1024x640.jpg 1024w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/Challenge-Accepted-Meme.jpg 1920w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><strong>El que \u00e9s d&#8217;inter\u00e8s en les de dades \u00e9s\u00a0fer veure que el 2014 baixa i el 2016 puja.<\/strong> Hem vist que si l&#8217;eix &#8220;y&#8221; no comen\u00e7a per 0, no es distingeix si puja o baixa.<\/p>\n<p>Us proposo 2\u00a0maneres per\u00a0resoldre-ho:<\/p>\n<ul>\n<li>Mostrar amb quin valor comen\u00e7a l&#8217;eix &#8220;y&#8221; (el que prefereixo jo)<\/li>\n<li>Si insistiu a\u00a0comen\u00e7ar per valor 0, tamb\u00e9 es poden mostrar percentatges de canvi en comptes dels valors absoluts.<\/li>\n<\/ul>\n<p>Intentem\u00a0primer aquesta segona opci\u00f3: <strong>Mostrar percentatges de canvi<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2570\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/variacions.png\" alt=\"variacions\" width=\"601\" height=\"405\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/variacions.png 601w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/variacions-300x202.png 300w\" sizes=\"auto, (max-width: 601px) 100vw, 601px\" \/><\/p>\n<p>Com veieu, si indiquem les\u00a0variacions de canvi, no es pot\u00a0saber quin \u00e9s l&#8217;increment absolut que representa cada\u00a0canvi percentual (B\u00e9, es podria utilitzar\u00a0etiquetes\u00a0o un segon eix &#8220;y&#8221; a la dreta).<\/p>\n<p>Intentem ara la primera opci\u00f3:\u00a0<strong>Mostrar el\u00a0valor on\u00a0comen\u00e7a l&#8217;eix &#8220;y&#8221;<\/strong><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2572\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/eix-y-1.png\" alt=\"eix-y\" width=\"589\" height=\"420\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/eix-y-1.png 589w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/eix-y-1-300x214.png 300w\" sizes=\"auto, (max-width: 589px) 100vw, 589px\" \/><\/p>\n<p>Ara, amb el gr\u00e0fic anterior tenim\u00a0m\u00e9s informaci\u00f3. Com veieu, si comences l&#8217;eix &#8220;y&#8221; per un valor diferent de\u00a00 i el mostres, no hi ha problema.<\/p>\n<p>I\u00a0si em pregunteu, com \u00e9s\u00a0un gr\u00e0fic temporal, jo utilitzaria un gr\u00e0fic de l\u00ednies.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2577\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/linies-3.png\" alt=\"linies\" width=\"554\" height=\"413\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/linies-3.png 554w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/linies-3-300x224.png 300w\" sizes=\"auto, (max-width: 554px) 100vw, 554px\" \/><\/p>\n<p><strong>Quan les dades no visualitzen la hist\u00f2ria, el gr\u00e0fic diu poc.\u00a0Per tant, no\u00a0tots els gr\u00e0fics han de comen\u00e7ar amb un 0 a l&#8217;eix &#8220;y&#8221;. L&#8217;important \u00e9s que les dades puguin interpretar-se correctament. Si comences amb un eix &#8220;y&#8221; diferent de 0, cal indicar-ho.<\/strong><\/p>\n<h2>Comunicar el que \u00e9s rellevant<\/h2>\n<p>Conversant\u00a0amb\u00a0Ivan Serrano (@ivoserrano) , dissenyador a TV3,\u00a0m&#8217;ha fet notar que haur\u00edem de q\u00fcestionar-nos si\u00a0\u00e9s correcte que mostrin\u00a0un gr\u00e0fic d&#8217;una cartolina. En 2 segons nom\u00e9s veus les barres.<\/p>\n<p>Jordi Graupera (@<span class=\"u-linkComplex-target\">JordiGraupera<\/span>): &#8220;Els pol\u00edtics haurien de poder dur gr\u00e0fics digitals als debats que se sobreimpressionessin o que hi hagu\u00e9s una pantalla gegant.&#8221;<\/p>\n<p>Per resumir, si nom\u00e9s tens 2 segons per explicar-lo,\u00a0millor explica-ho i no ensenyis res.\u00a0Per\u00f2 en altre cas, tingues en compte que no sempre cal comen\u00e7ar l&#8217;eix &#8220;y&#8221; per 0. Si mostres per on comen\u00e7a l&#8217;eix &#8220;y&#8221;, no hi ha problema.<\/p>\n<p>Si discrepes, comenta-ho. Si saps d&#8217;alg\u00fa que discrepa o que pot\u00a0ajudar-lo, comparteix-li l&#8217;article.<\/p>\n<p>Per acabar, un &#8220;divertimento&#8221;.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-2579\" src=\"http:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/perspectiva-1.png\" alt=\"perspectiva\" width=\"605\" height=\"425\" srcset=\"https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/perspectiva-1.png 605w, https:\/\/elnostreraco.com\/blog\/wp-content\/uploads\/perspectiva-1-300x211.png 300w\" sizes=\"auto, (max-width: 605px) 100vw, 605px\" \/><\/p>\n<p>Qu\u00e8 en penseu d&#8217;aquest gr\u00e0fic en &#8220;perspectiva&#8221;? L&#8217;eix &#8220;y&#8221; comen\u00e7a pel valor del 2011.<\/p>\n<p>Per m\u00e9s informaci\u00f3, us recomano el llibre de\u00a0<strong>Edward Tufte, The Visual Display of Quantitative Information<\/strong>:<\/p>\n<div style=\"position: relative; height: 240px;\"><iframe loading=\"lazy\" style=\"float: left; width: 120px; height: 240px;\" src=\"\/\/rcm-eu.amazon-adsystem.com\/e\/cm?lt1=_blank&amp;bc1=000000&amp;IS2=1&amp;bg1=FFFFFF&amp;fc1=000000&amp;lc1=0000FF&amp;t=elnostraco-21&amp;o=30&amp;p=8&amp;l=as4&amp;m=amazon&amp;f=ifr&amp;ref=as_ss_li_til&amp;asins=B00BP0O6N6&amp;linkId=9c3fdb70382fe38856cc4b1ea65d6ae7\" width=\"300\" height=\"150\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><br \/>\n<iframe loading=\"lazy\" style=\"float: left; width: 120px; height: 240px;\" src=\"\/\/ws-na.amazon-adsystem.com\/widgets\/q?ServiceVersion=20070822&amp;OneJS=1&amp;Operation=GetAdHtml&amp;MarketPlace=US&amp;source=ss&amp;ref=as_ss_li_til&amp;ad_type=product_link&amp;tracking_id=elnostraco-20&amp;marketplace=amazon&amp;region=US&amp;placement=0961392142&amp;asins=0961392142&amp;linkId=1cab5f2aae1b2ada1a90e86bd76ec173&amp;show_border=true&amp;link_opens_in_new_window=true\" width=\"300\" height=\"150\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/div>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>No indicar per quin valor comen\u00e7a l&#8217;eix &#8220;y&#8221; quan comen\u00e7a per un valor diferent de 0 \u00e9s manipular. Si no \u00e9s 0 i l&#8217;indiques \u00e9s explicar una hist\u00f2ria.<\/p>\n","protected":false},"author":1,"featured_media":2579,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-2564","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-analytics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Valor per on comen\u00e7a l&#039;eix &quot;y&quot; en la visualitzaci\u00f3 de dades ~ 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\/visualitzacio-dades-comencament-eix-y\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Valor per on comen\u00e7a l&#039;eix &quot;y&quot; en la visualitzaci\u00f3 de dades ~ Anal\u00edtica\" \/>\n<meta property=\"og:description\" content=\"No indicar per quin valor comen\u00e7a l&#039;eix &quot;y&quot; quan comen\u00e7a per un valor diferent de 0 \u00e9s manipular. 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