{"id":1631,"date":"2023-07-25T14:26:50","date_gmt":"2023-07-25T14:26:50","guid":{"rendered":"https:\/\/statorials.org\/it\/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\/it\/smape-in-r\/","title":{"rendered":"Come calcolare smape in r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>L&#8217;errore percentuale assoluto medio simmetrico (SMAPE)<\/strong> viene utilizzato per misurare l&#8217;accuratezza predittiva dei modelli. Viene calcolato come segue:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>SMAPE<\/strong> = (1\/n) * \u03a3(|previsione \u2013 effettivo| \/ ((|attuale| + |previsione|)\/2) * 100<\/span><\/p>\n<p> <span style=\"color: #000000;\">Oro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>\u03a3<\/strong> \u2013 un simbolo che significa \u201csomma\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>n<\/strong> \u2013 dimensione del campione<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>reale<\/strong> : il valore effettivo dei dati<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>previsione<\/strong> \u2013 il valore atteso dei dati<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Minore \u00e8 il valore di SMAPE, migliore \u00e8 l&#8217;accuratezza predittiva di un dato modello.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Questo tutorial spiega due diversi metodi che puoi utilizzare per calcolare SMAPE in R.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Metodo 1: utilizzare smape() dal pacchetto Metrics<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Un modo per calcolare SMAPE in R \u00e8 utilizzare la funzione <strong>smape()<\/strong> dal pacchetto <strong>Metrics<\/strong> :<\/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;\">Possiamo vedere che l&#8217;errore percentuale assoluto medio simmetrico per questo modello \u00e8 <strong>del 12,45%<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Metodo 2: scrivi la tua funzione<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Un altro modo per calcolare SMAPE \u00e8 creare la nostra funzione come segue:<\/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;\">Possiamo quindi utilizzare questa funzione per calcolare lo SMAPE tra un vettore di valori effettivi e valori previsti:<\/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;\">Ancora una volta, lo SMAPE risulta essere <strong>12,45%<\/strong> , che corrisponde ai risultati dell&#8217;esempio precedente.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Risorse addizionali<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/it\/carta-r\/\" target=\"_blank\" rel=\"noopener\">Come calcolare MAPE in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/errore-assoluto-medio-in-r\/\" target=\"_blank\" rel=\"noopener\">Come calcolare MAD in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/errore-assoluto-medio-in-r\/\" target=\"_blank\" rel=\"noopener\">Come calcolare il MAE in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/come-calcolare-rmse-in-r\/\" target=\"_blank\" rel=\"noopener\">Come calcolare l&#8217;RMSE in R<\/a><br \/> <a href=\"https:\/\/statorials.org\/it\/come-calcolare-mse-in-r\/\" target=\"_blank\" rel=\"noopener\">Come calcolare MSE in R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>L&#8217;errore percentuale assoluto medio simmetrico (SMAPE) viene utilizzato per misurare l&#8217;accuratezza predittiva dei modelli. Viene calcolato come segue: SMAPE = (1\/n) * \u03a3(|previsione \u2013 effettivo| \/ ((|attuale| + |previsione|)\/2) * 100 Oro: \u03a3 \u2013 un simbolo che significa \u201csomma\u201d n \u2013 dimensione del campione reale : il valore effettivo dei dati previsione \u2013 il valore [&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":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Come calcolare lo SMAPE in R - Statorials<\/title>\n<meta name=\"description\" content=\"Questo tutorial spiega come calcolare l&#039;errore percentuale assoluto medio simmetrico (SMAPE) in R, inclusi esempi.\" \/>\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\/it\/smape-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"it_IT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Come calcolare lo SMAPE in R - Statorials\" \/>\n<meta property=\"og:description\" content=\"Questo tutorial spiega come calcolare l&#039;errore percentuale assoluto medio simmetrico (SMAPE) in R, inclusi esempi.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/it\/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=\"Benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/it\/smape-in-r\/\",\"url\":\"https:\/\/statorials.org\/it\/smape-in-r\/\",\"name\":\"Come calcolare lo SMAPE in R - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/it\/#website\"},\"datePublished\":\"2023-07-25T14:26:50+00:00\",\"dateModified\":\"2023-07-25T14:26:50+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\"},\"description\":\"Questo tutorial spiega come calcolare l&#39;errore percentuale assoluto medio simmetrico (SMAPE) in R, inclusi esempi.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/it\/smape-in-r\/#breadcrumb\"},\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/it\/smape-in-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/it\/smape-in-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Casa\",\"item\":\"https:\/\/statorials.org\/it\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Come calcolare smape in r\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/it\/#website\",\"url\":\"https:\/\/statorials.org\/it\/\",\"name\":\"Statorials\",\"description\":\"La tua guida all&#039;alfabetizzazione statistica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/it\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"it-IT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/0896f191fb9fb019f2cd8623112cb3ae\",\"name\":\"Benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"it-IT\",\"@id\":\"https:\/\/statorials.org\/it\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/it\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Benjamin anderson\"},\"description\":\"Ciao, sono Benjamin, un professore di statistica in pensione diventato insegnante dedicato di Statorials. 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