{"id":1631,"date":"2023-07-25T14:26:50","date_gmt":"2023-07-25T14:26:50","guid":{"rendered":"https:\/\/statorials.org\/nl\/smape-in-r\/"},"modified":"2023-07-25T14:26:50","modified_gmt":"2023-07-25T14:26:50","slug":"smape-in-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/smape-in-r\/","title":{"rendered":"Hoe smape in r 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;\">Hoe kleiner de waarde van SMAPE, hoe beter de voorspellende nauwkeurigheid van een bepaald model.<\/span><\/p>\n<p> <span style=\"color: #000000;\">In deze tutorial worden twee verschillende methoden uitgelegd die u kunt gebruiken om SMAPE in R te berekenen.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Methode 1: Gebruik smape() uit het Metrics-pakket<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">E\u00e9n manier om SMAPE in R te berekenen is door de functie <strong>smape()<\/strong> uit het <strong>Metrics-<\/strong> pakket te gebruiken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #993300;\">library<\/span> (Metrics)\n\n<span style=\"color: #008080;\">#define actual values\n<\/span>actual &lt;- c(12, 13, 14, 15, 15, 22, 27)\n\n<span style=\"color: #008080;\">#define forecasted values\n<\/span>forecast &lt;- c(11, 13, 14, 14, 15, 16, 18)\n\n<span style=\"color: #008080;\">#calculate SMAPE\n<\/span>smape(actual, forecast)\n\n[1] 0.1245302\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen zien dat de symmetrische gemiddelde absolute procentuele fout voor dit model <strong>12,45%<\/strong> bedraagt.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Methode 2: Schrijf uw eigen functie<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Een andere manier om SMAPE te berekenen is door als volgt onze eigen functie te maken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>find_smape &lt;- <span style=\"color: #993300;\">function<\/span> (a, f) {\n  <span style=\"color: #3366ff;\">return<\/span> ( <span style=\"color: #008000;\">1<\/span> \/length(a) * sum( <span style=\"color: #008000;\">2<\/span> *abs(fa) \/ (abs(a)+abs(f))* <span style=\"color: #008000;\">100<\/span> ))\n}\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">We kunnen deze functie vervolgens gebruiken om de SMAPE te berekenen tussen een vector van werkelijke waarden en voorspelde waarden:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#define actual values\n<\/span>actual &lt;- c(12, 13, 14, 15, 15,22, 27)\n\n<span style=\"color: #008080;\">#define forecasted values\n<\/span>forecast &lt;- c(11, 13, 14, 14, 15, 16, 18)\n\n<span style=\"color: #008080;\">#calculate SMAPE\n<\/span>find_smape(actual, forecast)\n\n[1] 12.45302<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Opnieuw blijkt de SMAPE <strong>12,45%<\/strong> te zijn, wat overeenkomt met de resultaten van het vorige voorbeeld.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/nl\/r-kaart\/\" target=\"_blank\" rel=\"noopener\">Hoe MAPE in R te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/gemiddelde-absolute-fout-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe MAD in R te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/gemiddelde-absolute-fout-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe MAE in R te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/hoe-rmse-in-r-te-berekenen\/\" target=\"_blank\" rel=\"noopener\">Hoe RMSE in R te berekenen<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/hoe-bereken-je-mse-in-r\/\" target=\"_blank\" rel=\"noopener\">Hoe MSE in R 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-1631","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 R - Statorials<\/title>\n<meta name=\"description\" content=\"In deze zelfstudie wordt uitgelegd hoe u Symmetric Mean Absolute Percentage Error (SMAPE) in R kunt berekenen, inclusief voorbeelden.\" \/>\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\/smape-in-r\/\" \/>\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 R - Statorials\" \/>\n<meta property=\"og:description\" content=\"In deze zelfstudie wordt uitgelegd hoe u Symmetric Mean Absolute Percentage Error (SMAPE) in R kunt berekenen, inclusief voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/smape-in-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T14:26:50+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\/smape-in-r\/\",\"url\":\"https:\/\/statorials.org\/nl\/smape-in-r\/\",\"name\":\"Hoe SMAPE te berekenen in R - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-25T14:26:50+00:00\",\"dateModified\":\"2023-07-25T14:26:50+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze zelfstudie wordt uitgelegd hoe u Symmetric Mean Absolute Percentage Error (SMAPE) in R kunt berekenen, inclusief voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/smape-in-r\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/smape-in-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/smape-in-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe smape in r 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. 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