{"id":1355,"date":"2023-07-26T18:02:38","date_gmt":"2023-07-26T18:02:38","guid":{"rendered":"https:\/\/statorials.org\/pt\/significa-erro-absoluto-python\/"},"modified":"2023-07-26T18:02:38","modified_gmt":"2023-07-26T18:02:38","slug":"significa-erro-absoluto-python","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/significa-erro-absoluto-python\/","title":{"rendered":"Como calcular o erro m\u00e9dio absoluto em python"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Nas estat\u00edsticas, <strong>o erro m\u00e9dio absoluto<\/strong> (MAE) \u00e9 uma forma de medir a precis\u00e3o de um determinado modelo. \u00c9 calculado da seguinte forma:<\/span><\/p>\n<p> <span style=\"color: #000000;\">MAE = (1\/n) * \u03a3|y <sub>i<\/sub> \u2013 x <sub>i<\/sub> |<\/span><\/p>\n<p> <span style=\"color: #000000;\">Ouro:<\/span><\/p>\n<ul>\n<li> <span style=\"color: #000000;\"><strong>\u03a3:<\/strong> Um s\u00edmbolo grego que significa \u201csoma\u201d<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>y <sub>i<\/sub> :<\/strong> O valor observado para a <sup>i-\u00e9sima<\/sup> observa\u00e7\u00e3o<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>x <sub>i<\/sub> :<\/strong> o valor previsto para a <sup>i-\u00e9sima<\/sup> observa\u00e7\u00e3o<\/span><\/li>\n<li> <span style=\"color: #000000;\"><strong>n:<\/strong> O n\u00famero total de observa\u00e7\u00f5es<\/span><\/li>\n<\/ul>\n<p> <span style=\"color: #000000;\">Podemos calcular facilmente o erro m\u00e9dio absoluto em Python usando a fun\u00e7\u00e3o <a href=\"https:\/\/scikit-learn.org\/stable\/modules\/generated\/sklearn.metrics.mean_absolute_error.html\" target=\"_blank\" rel=\"noopener\">Mean_absolute_error()<\/a> do Scikit-learn.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este tutorial fornece um exemplo pr\u00e1tico de uso desse recurso.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Exemplo: Calculando o erro m\u00e9dio absoluto em Python<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que temos as seguintes matrizes de valores reais e valores previstos em Python:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>actual = [12, 13, 14, 15, 15, 22, 27]\npred = [11, 13, 14, 14, 15, 16, 18]\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">O c\u00f3digo a seguir mostra como calcular o erro m\u00e9dio absoluto para este modelo:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <span style=\"color: #000000;\"><strong><span style=\"color: #008000;\">from<\/span> sklearn. <span style=\"color: #3366ff;\">metrics<\/span> <span style=\"color: #008000;\">import<\/span> mean_absolute_error <span style=\"color: #008000;\">as<\/span> mae\n\n<span style=\"color: #008080;\">#calculate MAE<\/span>\nmae(actual, pred)\n\n2.4285714285714284\n<\/strong><\/span><\/pre>\n<p> <span style=\"color: #000000;\">O erro absoluto m\u00e9dio (MAE) \u00e9 <strong>2,42857<\/strong> .<\/span><\/p>\n<p> <span style=\"color: #000000;\">Isso nos diz que a diferen\u00e7a m\u00e9dia entre o valor real dos dados e o valor previsto pelo modelo \u00e9 2,42857.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos comparar este MAE com o MAE obtido por outros modelos de previs\u00e3o para ver quais modelos apresentam melhor desempenho.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Quanto menor o MAE para um determinado modelo, melhor o modelo ser\u00e1 capaz de prever os valores reais.<\/span><\/p>\n<p> <span style=\"color: #000000;\"><strong>Nota:<\/strong> Tanto a matriz de valores reais quanto a matriz de valores previstos devem ter o mesmo comprimento para que esta fun\u00e7\u00e3o funcione corretamente.<\/span><\/p>\n<h3> <strong>Recursos adicionais<\/strong><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/cartao-python\/\" target=\"_blank\" rel=\"noopener\">Como calcular MAPE em Python<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/smape-python\/\" target=\"_blank\" rel=\"noopener\">Como calcular SMAPE em Python<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/significa-erro-quadrado-python\/\" target=\"_blank\" rel=\"noopener\">Como calcular MSE em Python<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nas estat\u00edsticas, o erro m\u00e9dio absoluto (MAE) \u00e9 uma forma de medir a precis\u00e3o de um determinado modelo. \u00c9 calculado da seguinte forma: MAE = (1\/n) * \u03a3|y i \u2013 x i | Ouro: \u03a3: Um s\u00edmbolo grego que significa \u201csoma\u201d y i : O valor observado para a i-\u00e9sima observa\u00e7\u00e3o x i : o [&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-1355","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 o erro m\u00e9dio absoluto em Python - Estatologia<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como calcular o erro m\u00e9dio absoluto em Python, com v\u00e1rios exemplos.\" \/>\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\/pt\/significa-erro-absoluto-python\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta 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