{"id":982,"date":"2023-07-28T02:41:13","date_gmt":"2023-07-28T02:41:13","guid":{"rendered":"https:\/\/statorials.org\/nl\/kleine-python\/"},"modified":"2023-07-28T02:41:13","modified_gmt":"2023-07-28T02:41:13","slug":"kleine-python","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/kleine-python\/","title":{"rendered":"Hoe smape in python te berekenen"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>Symmetric Mean Absolute Percentage Error (SMAPE)<\/strong> wordt gebruikt om de voorspellende nauwkeurigheid van modellen te meten. Het wordt als volgt berekend:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>SMAPE<\/strong> = (1\/n) * \u03a3(|voorspelling \u2013 actueel| \/ ((|actueel| + |voorspelling|)\/2) * 100<\/span><\/p>\n<p> <span style=\"color: #000000;\">Goud:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>\u03a3<\/strong> \u2013 een symbool dat \u201csom\u201d betekent<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>n<\/strong> \u2013 steekproefomvang<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>real<\/strong> \u2013 de werkelijke waarde van de gegevens<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>voorspelling<\/strong> \u2013 de verwachte waarde van de gegevens<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">In deze tutorial wordt uitgelegd hoe u SMAPE in Python berekent.<\/span><\/span><\/p>\n<h3> <strong>Hoe SMAPE in Python te berekenen<\/strong><\/h3>\n<p> <span style=\"color: #000000;\">Er is geen ingebouwde Python-functie om SMAPE te berekenen, maar we kunnen er wel een eenvoudige functie voor maken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import <span style=\"color: #000000;\">numpy<\/span> as <span style=\"color: #000000;\">np<\/span>\n\n<span style=\"color: #000000;\"><span style=\"color: #008000;\">def<\/span> smape( <span style=\"color: #3366ff;\">a<\/span> , <span style=\"color: #3366ff;\">f<\/span> ):\n    <span style=\"color: #008000;\">return<\/span> 1\/ <span style=\"color: #3366ff;\">len<\/span> (a) * np. <span style=\"color: #3366ff;\">sum<\/span> (2 * np. <span style=\"color: #3366ff;\">abs<\/span> (fa) \/ (np. <span style=\"color: #3366ff;\">abs<\/span> (a) + np. <span style=\"color: #3366ff;\">abs<\/span> (f))*100)\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen deze functie vervolgens gebruiken om de SMAPE voor twee tabellen te berekenen: \u00e9\u00e9n die de werkelijke gegevenswaarden bevat en \u00e9\u00e9n die de voorspelde gegevenswaarden bevat.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define arrays of actual and forecasted data values<\/span>\nactual = np.array([12, 13, 14, 15, 15,22, 27])\nforecast = np.array([11, 13, 14, 14, 15, 16, 18])\n\n<span style=\"color: #008080;\">#calculate SMAPE<\/span>\nsmape(actual, forecast)\n\n12.45302\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Uit de resultaten kunnen we zien dat de gemiddelde symmetrische absolute procentuele fout voor dit model <strong>12,45302%<\/strong> bedraagt.<\/span><\/p>\n<h3> <strong><span style=\"color: #000000;\">Aanvullende bronnen<\/span><\/strong><\/h3>\n<p> <a href=\"https:\/\/en.wikipedia.org\/wiki\/Symmetric_mean_absolute_percentage_error\" target=\"_blank\" rel=\"noopener noreferrer\">Wikipedia-artikel voor SMAPE<\/a><br \/> <a href=\"https:\/\/robjhyndman.com\/hyndsight\/smape\/\" target=\"_blank\" rel=\"noopener noreferrer\">Rob J. Hyndmans gedachten over SMAPE<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/python-kaart\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hoe MAPE in Python te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/r-kaart\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hoe MAPE in R te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/excel-kaart\/\" target=\"_blank\" rel=\"noopener noreferrer\">Hoe MAPE in Excel te berekenen<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Symmetric Mean Absolute Percentage Error (SMAPE) wordt gebruikt om de voorspellende nauwkeurigheid van modellen te meten. Het wordt als volgt berekend: SMAPE = (1\/n) * \u03a3(|voorspelling \u2013 actueel| \/ ((|actueel| + |voorspelling|)\/2) * 100 Goud: \u03a3 \u2013 een symbool dat \u201csom\u201d betekent n \u2013 steekproefomvang real \u2013 de werkelijke waarde van de gegevens voorspelling \u2013 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-982","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hoe SMAPE te berekenen in Python - Statorials<\/title>\n<meta name=\"description\" content=\"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/nl\/kleine-python\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe SMAPE te berekenen in Python - Statorials\" \/>\n<meta property=\"og:description\" content=\"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/kleine-python\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T02:41:13+00:00\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"1\u00a0Minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/kleine-python\/\",\"url\":\"https:\/\/statorials.org\/nl\/kleine-python\/\",\"name\":\"Hoe SMAPE te berekenen in Python - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-28T02:41:13+00:00\",\"dateModified\":\"2023-07-28T02:41:13+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/kleine-python\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/kleine-python\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/kleine-python\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe smape in python te berekenen\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. Ik heb uitgebreide ervaring en expertise op het gebied van statistiek en ik ben vastbesloten om mijn kennis te delen met studenten via Statorials. Lees verder\",\"sameAs\":[\"http:\/\/statorials.org\/nl\"]}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Hoe SMAPE te berekenen in Python - Statorials","description":"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/statorials.org\/nl\/kleine-python\/","og_locale":"de_DE","og_type":"article","og_title":"Hoe SMAPE te berekenen in Python - Statorials","og_description":"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.","og_url":"https:\/\/statorials.org\/nl\/kleine-python\/","og_site_name":"Statorials","article_published_time":"2023-07-28T02:41:13+00:00","author":"Dr.benjamin anderson","twitter_card":"summary_large_image","twitter_misc":{"Verfasst von":"Dr.benjamin anderson","Gesch\u00e4tzte Lesezeit":"1\u00a0Minute"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/statorials.org\/nl\/kleine-python\/","url":"https:\/\/statorials.org\/nl\/kleine-python\/","name":"Hoe SMAPE te berekenen in Python - Statorials","isPartOf":{"@id":"https:\/\/statorials.org\/nl\/#website"},"datePublished":"2023-07-28T02:41:13+00:00","dateModified":"2023-07-28T02:41:13+00:00","author":{"@id":"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219"},"description":"Een eenvoudige uitleg over het berekenen van SMAPE in Python, met een voorbeeld.","breadcrumb":{"@id":"https:\/\/statorials.org\/nl\/kleine-python\/#breadcrumb"},"inLanguage":"de","potentialAction":[{"@type":"ReadAction","target":["https:\/\/statorials.org\/nl\/kleine-python\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/statorials.org\/nl\/kleine-python\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Thuis","item":"https:\/\/statorials.org\/nl\/"},{"@type":"ListItem","position":2,"name":"Hoe smape in python te berekenen"}]},{"@type":"WebSite","@id":"https:\/\/statorials.org\/nl\/#website","url":"https:\/\/statorials.org\/nl\/","name":"Statorials","description":"Uw gids voor statistische competentie","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/statorials.org\/nl\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"de"},{"@type":"Person","@id":"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219","name":"Dr.benjamin anderson","image":{"@type":"ImageObject","inLanguage":"de","@id":"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/","url":"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","contentUrl":"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg","caption":"Dr.benjamin anderson"},"description":"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. Ik heb uitgebreide ervaring en expertise op het gebied van statistiek en ik ben vastbesloten om mijn kennis te delen met studenten via Statorials. Lees verder","sameAs":["http:\/\/statorials.org\/nl"]}]}},"yoast_meta":{"yoast_wpseo_title":"","yoast_wpseo_metadesc":"","yoast_wpseo_canonical":""},"_links":{"self":[{"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/posts\/982","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/comments?post=982"}],"version-history":[{"count":0,"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/posts\/982\/revisions"}],"wp:attachment":[{"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/media?parent=982"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/categories?post=982"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/statorials.org\/nl\/wp-json\/wp\/v2\/tags?post=982"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}