{"id":5472,"date":"2010-08-25T18:26:47","date_gmt":"2010-08-25T16:26:47","guid":{"rendered":"https:\/\/www.xaviergimeno.net\/ca\/?p=5472"},"modified":"2023-06-15T16:37:56","modified_gmt":"2023-06-15T14:37:56","slug":"vigilancia-epistemologica-mostreig","status":"publish","type":"post","link":"https:\/\/xaviergimeno.net\/ca\/vigilancia-epistemologica-mostreig-5472","title":{"rendered":"Vigil\u00e0ncia epistemol\u00f2gica i mostreig"},"content":{"rendered":"<p style=\"text-align: left;\">Fa uns dies navegava per la meva p\u00e0gina de Twitter, i una de les persones a qui segueixo va publicar un comentari amb tota la seva bona fe. Un amic seu estava realitzant un estudi per al m\u00e0ster que estava cursant i el primer demanava als seus contactes <!--more Seguir llegint \u2192-->que contestessin l&#8217;enquesta en l\u00ednia del seu amic que estava penjada en una p\u00e0gina web. Obviar\u00e9 detalls sobre l&#8217;objecte d&#8217;estudi, per\u00f2 dir\u00e9 que des d&#8217;un punt de vista metodol\u00f2gic l&#8217;estudi pretenia &#8220;tenir un coneixement del panorama actual d&#8217;aquest sector [educatiu]&#8221;. \u00c9s a dir, que buscava obtenir informaci\u00f3 representativa sobre temes relacionats amb formaci\u00f3. L&#8217;estrat\u00e8gia mostral m\u00e9s adequada per aconseguir aquest objectiu \u00e9s realitzar un mostreig aleatori. I aqu\u00ed rau el problema.<\/p>\n<p style=\"text-align: left;\">Demanar &#8220;voluntaris&#8221;, que serien captats entre els nostres contactes, perqu\u00e8 realitzin l&#8217;enquesta del nostre amic vol dir violar de manera rotunda el criteri d&#8217;aleatorietat. Per qu\u00e8? \u00c9s molt simple: els contactes s&#8217;escullen a partir de les afinitats. \u00c9s a dir, tendim a tenir amics als quals els agraden les mateixes coses que nosaltres: \u00e9s evident que els amics no es trien de forma aleat\u00f2ria: al primer que passa pel carrer no se li demana que &#8220;sigui el nostre amic&#8221;. Sobre aix\u00f2 hi ha molt escrit, i una de les millors obres sobre el tema, que documenta sense cap mena de dubte aquesta afirmaci\u00f3 \u00e9s <em><a title=\"Distinction\" href=\"https:\/\/books.google.com\/books?id=TJp7hqxQ0SUC&#038;printsec=frontcover&#038;redir_esc=y#v=onepage&#038;q&#038;f=false\" target=\"_blank\" rel=\"noopener\">Distinction<\/a><\/em>, un <em>tour de force<\/em> obra de Pierre Bourdieu a qu\u00e8 aquest cient\u00edfic social va dedicar quinze anys d&#8217;investigaci\u00f3. Es tracta de la segona obra de ci\u00e8ncies socials m\u00e9s important de tots els temps segons la ISA (International Sociological Association).<\/p>\n<p style=\"text-align: left;\">Des d&#8217;un punt de vista metodol\u00f2gic optar per una estrat\u00e8gia mostral com demanar-li als nostres contactes de Twitter o Facebook que contestin una enquesta \u2014el que seria equivalent a realitzar un mostreig de <em>bola de neu<\/em>\u2014, quan en realitat caldria un mostreig estrictament aleatori, implica que la mostra obtinguda no \u00e9s representativa, el que significa, des del punt de vista dels resultats i les conclusions obtingudes, que les dades no s\u00f3n fiables. \u00c9s a dir, es violen els criteris de representativitat i fiabilitat. Poc podem fiar-nos del que digui aquest estudi. I aix\u00f2 simplement per escollir malament la forma de captar els subjectes d&#8217;estudi i no pensar-la amb el necessari rigor, ja que s&#8217;introdueix un clar biaix que est\u00e0 documentat en qualsevol manual de metodologia d&#8217;enquestes per mostreig: l&#8217;anomenat <em>biaix de selecci\u00f3<\/em>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Optar de manera irreflexiva per captar els participants d\u2019un estudi mitjan\u00e7ant els contactes que hem establert a les xarxes socials \u00e9s una molt mala estrat\u00e8gia mostral i pot sortir-nos molt cara. Tan cara que pot invalidar d&#8217;arrel la fiabilitat i representativitat dels resultats obtinguts. Optar per aquesta estrat\u00e8gia seria an\u00e0leg a efectuar un mostreig de bola de neu quan, contr\u00e0riament, l&#8217;estrat\u00e8gia mostral que caldria seria un mostreig aleatori.<\/p>\n","protected":false},"author":3,"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,"mc4wp_mailchimp_campaign":[],"footnotes":""},"categories":[89,66],"tags":[127,125,105],"class_list":["post-5472","post","type-post","status-publish","format-standard","hentry","category-epistemologia-ciencies-socials","category-metodologia","tag-mostreig","tag-mostreig-aleatori-estratificat","tag-vigilancia-epistemologica"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Vigil\u00e0ncia 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