{"id":4590,"date":"2026-08-11T11:49:11","date_gmt":"2026-08-11T09:49:11","guid":{"rendered":"https:\/\/ellistat.com\/?post_type=guide-dutilisateur&#038;p=4590"},"modified":"2026-08-11T11:49:11","modified_gmt":"2026-08-11T09:49:11","slug":"potenza","status":"publish","type":"guide-dutilisateur","link":"https:\/\/ellistat.com\/it\/guide-dutilisateur\/puissance\/","title":{"rendered":"Potenza"},"content":{"rendered":"<p class=\"wp-block-paragraph\">La potenza \u00e8 la probabilit\u00e0 che&nbsp;<strong>individuare una discrepanza effettivamente esistente<\/strong>. Il suo complemento \u00e8 il&nbsp;<strong>rischio beta<\/strong>&nbsp;: non rendersi conto di una differenza reale.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Questa pagina mette in relazione quattro grandezze, tre delle quali determinano la quarta:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>la\u00a0<strong>dimensione del campione<\/strong>\u00a0;<\/li>\n\n\n\n<li>la\u00a0<strong>differenza verificata<\/strong>\u00a0: lo scostamento che si desidera poter rilevare; ;<\/li>\n\n\n\n<li>la dispersione: <strong>sigma<\/strong>, oppure il\u00a0<strong>rapporto sigma<\/strong>\u00a0;<\/li>\n\n\n\n<li>le\u00a0<strong>rischi<\/strong>\u00a0alfa e beta.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">I test contemplati:\u00a0<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Test Z<\/strong>\u00a0e\u00a0<strong>Test T<\/strong>\u00a0rispetto a un valore teorico,\u00a0<\/li>\n\n\n\n<li><strong>Test T<\/strong>\u00a0per confrontare due medie,\u00a0<\/li>\n\n\n\n<li><strong>Test T appaiato<\/strong>,\u00a0<\/li>\n\n\n\n<li><strong>ANOVA<\/strong>\u00a0per diverse medie,\u00a0<\/li>\n\n\n\n<li><strong>Test del chi-quadrato<\/strong>\u00a0e\u00a0<strong>Test F<\/strong>\u00a0sulle deviazioni standard,\u00a0<\/li>\n\n\n\n<li><strong>Test 1P<\/strong>\u00a0e\u00a0<strong>Test 2P<\/strong>\u00a0sulle proporzioni. <\/li>\n\n\n\n<li>Una sezione tratta il tema\u00a0<strong>piano sperimentale 2k<\/strong>, a seconda del numero di fattori, del numero di righe e del numero di termini di secondo ordine.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Esempio: calcolare la dimensione del campione necessaria per dimostrare una differenza da 15% a 5% tra due lotti: (risposta: 111 pezzi in ciascun lotto)<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"892\" height=\"762\" src=\"https:\/\/ellistat.com\/wp-content\/uploads\/puissance.png\" alt=\"\" class=\"wp-image-4591\" srcset=\"https:\/\/ellistat.com\/wp-content\/uploads\/puissance.png 892w, https:\/\/ellistat.com\/wp-content\/uploads\/puissance-300x256.png 300w, https:\/\/ellistat.com\/wp-content\/uploads\/puissance-768x656.png 768w, https:\/\/ellistat.com\/wp-content\/uploads\/puissance-14x12.png 14w\" sizes=\"auto, (max-width: 892px) 100vw, 892px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\ud83d\udca1&nbsp;<strong>Questa \u00e8 la pagina da aprire prima della prova, non dopo.<\/strong>&nbsp;Risponde alla domanda \u00abquanti campioni devo misurare?\u00bb, la cui risposta determina tutto il resto. Avviare uno studio con un campione sottodimensionato significa garantire un risultato \u00abnon significativo\u00bb che non dimostrer\u00e0 nulla e che dovr\u00e0 essere ripetuto.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u26a0\ufe0f La conseguenza \u00e8 spiacevole ma utile: individuare una piccola discrepanza \u00e8 costoso. Dimezzare la discrepanza rilevabile quadruplica la dimensione del campione necessaria. \u00c8 meglio saperlo prima di avviare le prove.<\/p>\n<\/blockquote>","protected":false},"featured_media":0,"menu_order":50,"template":"","meta":{"_acf_changed":true},"menu-guide-dutilisateur":[23],"class_list":["post-4590","guide-dutilisateur","type-guide-dutilisateur","status-publish","hentry","menu-guide-dutilisateur-5-statistiques-inferentielles"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.2 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Puissance - Ellistat<\/title>\n<meta name=\"description\" content=\"Combien de pi\u00e8ces mesurer pour d\u00e9tecter un \u00e9cart r\u00e9el ? 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