{"id":1630,"date":"2023-07-25T14:26:50","date_gmt":"2023-07-25T14:26:50","guid":{"rendered":"https:\/\/statorials.org\/pt\/smape-em-r\/"},"modified":"2023-07-25T14:26:50","modified_gmt":"2023-07-25T14:26:50","slug":"smape-em-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/smape-em-r\/","title":{"rendered":"Como calcular smape em r"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\"><strong>O erro percentual m\u00e9dio absoluto sim\u00e9trico (SMAPE)<\/strong> \u00e9 usado para medir a precis\u00e3o preditiva dos modelos. \u00c9 calculado da seguinte forma:<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>SMAPE<\/strong> = (1\/n) * \u03a3(|previs\u00e3o \u2013 real| \/ ((|real| + |previs\u00e3o|)\/2) * 100<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ouro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>\u03a3<\/strong> \u2013 um s\u00edmbolo que significa \u201csoma\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>n<\/strong> \u2013 tamanho da amostra<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>real<\/strong> \u2013 o valor real dos dados<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>previs\u00e3o<\/strong> \u2013 o valor esperado dos dados<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Quanto menor o valor do SMAPE, melhor ser\u00e1 a precis\u00e3o preditiva de um determinado modelo.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este tutorial explica dois m\u00e9todos diferentes que voc\u00ea pode usar para calcular SMAPE em R.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>M\u00e9todo 1: Use smape() do pacote Metrics<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Uma maneira de calcular SMAPE em R \u00e9 usar a fun\u00e7\u00e3o <strong>smape()<\/strong> do pacote <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;\">Podemos ver que o erro percentual absoluto m\u00e9dio sim\u00e9trico para este modelo \u00e9 <strong>de 12,45%<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>M\u00e9todo 2: Escreva sua pr\u00f3pria fun\u00e7\u00e3o<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Outra forma de calcular o SMAPE \u00e9 criar nossa pr\u00f3pria fun\u00e7\u00e3o da seguinte forma:<\/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;\">Podemos ent\u00e3o usar esta fun\u00e7\u00e3o para calcular o SMAPE entre um vetor de valores reais e valores previstos:<\/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;\">Mais uma vez, o SMAPE \u00e9 de <strong>12,45%<\/strong> , o que corresponde aos resultados do exemplo anterior.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/cartao\/\" target=\"_blank\" rel=\"noopener\">Como calcular o MAPE em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/erro-absoluto-medio-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular MAD em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/erro-absoluto-medio-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular MAE em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/como-calcular-rmse-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular RMSE em R<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/como-calcular-mse-em-r\/\" target=\"_blank\" rel=\"noopener\">Como calcular MSE em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>O erro percentual m\u00e9dio absoluto sim\u00e9trico (SMAPE) \u00e9 usado para medir a precis\u00e3o preditiva dos modelos. \u00c9 calculado da seguinte forma: SMAPE = (1\/n) * \u03a3(|previs\u00e3o \u2013 real| \/ ((|real| + |previs\u00e3o|)\/2) * 100 Ouro: \u03a3 \u2013 um s\u00edmbolo que significa \u201csoma\u201d n \u2013 tamanho da amostra real \u2013 o valor real dos dados previs\u00e3o [&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-1630","post","type-post","status-publish","format-standard","hentry","category-guia"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Como calcular SMAPE em R - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular o erro percentual m\u00e9dio absoluto sim\u00e9trico (SMAPE) em R, incluindo exemplos.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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