{"id":968,"date":"2023-07-28T03:48:36","date_gmt":"2023-07-28T03:48:36","guid":{"rendered":"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/"},"modified":"2023-07-28T03:48:36","modified_gmt":"2023-07-28T03:48:36","slug":"media-movel-exponencial-do-pandas","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/","title":{"rendered":"Como calcular uma m\u00e9dia m\u00f3vel exponencial em pandas"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Na an\u00e1lise de s\u00e9ries temporais, uma <strong>m\u00e9dia m\u00f3vel<\/strong> \u00e9 simplesmente o valor m\u00e9dio de v\u00e1rios per\u00edodos anteriores.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Uma <strong>m\u00e9dia m\u00f3vel exponencial<\/strong> \u00e9 um tipo de m\u00e9dia m\u00f3vel que d\u00e1 mais peso \u00e0s observa\u00e7\u00f5es recentes, o que significa que \u00e9 capaz de capturar tend\u00eancias recentes mais rapidamente.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este tutorial explica como calcular uma m\u00e9dia m\u00f3vel exponencial para uma coluna de valores em um DataFrame do pandas.<\/span><\/p>\n<h3> <strong>Exemplo: m\u00e9dia m\u00f3vel exponencial em pandas<\/strong><\/h3>\n<p> <span style=\"color: #000000;\">Suponha que temos o seguinte DataFrame do pandas:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> pandas <span style=\"color: #107d3f;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#createDataFrame<\/span>\ndf = pd.DataFrame({'period': [1, 2, 3, 4, 5, 6, 7, 8, 9, 10],\n                   'sales': [25, 20, 14, 16, 27, 20, 12, 15, 14, 19]})\n\n<span style=\"color: #008080;\">#view DataFrame<\/span> \ndf\n\n        period sales\n0 1 25\n1 2 20\n2 3 14\n3 4 16\n4 5 27\n5 6 20\n6 7 12\n7 8 15\n8 9 14\n9 10 19\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Podemos usar a fun\u00e7\u00e3o <a href=\"https:\/\/pandas.pydata.org\/pandas-docs\/stable\/reference\/api\/pandas.DataFrame.ewm.html\" target=\"_blank\" rel=\"noopener noreferrer\">pandas.DataFrame.ewm()<\/a> para calcular a m\u00e9dia m\u00f3vel ponderada exponencialmente para v\u00e1rios per\u00edodos anteriores.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Por exemplo, veja como calcular a m\u00e9dia m\u00f3vel exponencialmente ponderada usando os quatro per\u00edodos anteriores:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create new column to hold 4-day exponentially weighted moving average<\/span>\ndf['4dayEWM'] = df['sales']. <span style=\"color: #3366ff;\">ewm<\/span> (span= <span style=\"color: #008000;\">4<\/span> , adjust= <span style=\"color: #008000;\">False<\/span> ). <span style=\"color: #3366ff;\">mean<\/span> ()\n\n<span style=\"color: #008080;\">#view DataFrame<\/span> \ndf\n\n        period sales 4dayEWM\n0 1 25 25.000000\n1 2 20 23.000000\n2 3 14 19.400000\n3 4 16 18.040000\n4 5 27 21.624000\n5 6 20 20.974400\n6 7 12 17.384640\n7 8 15 16.430784\n8 9 14 15.458470\n9 10 19 16.875082<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Tamb\u00e9m podemos usar a biblioteca matplotlib para visualizar as vendas em rela\u00e7\u00e3o \u00e0 m\u00e9dia m\u00f3vel ponderada exponencialmente de 4 dias:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #107d3f;\">import<\/span> matplotlib.pyplot <span style=\"color: #107d3f;\">as<\/span> plt\n\n<span style=\"color: #008080;\">#plot sales and 4-day exponentially weighted moving average<\/span>\nplt. <span style=\"color: #3366ff;\">plot<\/span> (df['sales'], label='Sales')\nplt. <span style=\"color: #3366ff;\">plot<\/span> (df['4dayEWM'], label='4-day EWM')\n\n<span style=\"color: #008080;\">#add legend to plot<\/span>\nplt. <span style=\"color: #3366ff;\">legend<\/span> (loc=2)\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-10144 \" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/ewmpandas1.png\" alt=\"M\u00e9dia m\u00f3vel ponderada exponencialmente em pandas\" width=\"464\" height=\"318\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/media-movel-python\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como calcular m\u00e9dias m\u00f3veis em Python<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/coluna-media-de-pandas\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como calcular a m\u00e9dia das colunas no Pandas<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/autocorrelacao-python\/\" target=\"_blank\" rel=\"noopener noreferrer\">Como calcular a autocorrela\u00e7\u00e3o em Python<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Na an\u00e1lise de s\u00e9ries temporais, uma m\u00e9dia m\u00f3vel \u00e9 simplesmente o valor m\u00e9dio de v\u00e1rios per\u00edodos anteriores. Uma m\u00e9dia m\u00f3vel exponencial \u00e9 um tipo de m\u00e9dia m\u00f3vel que d\u00e1 mais peso \u00e0s observa\u00e7\u00f5es recentes, o que significa que \u00e9 capaz de capturar tend\u00eancias recentes mais rapidamente. Este tutorial explica como calcular uma m\u00e9dia m\u00f3vel exponencial [&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-968","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 uma m\u00e9dia m\u00f3vel exponencial em Pandas<\/title>\n<meta name=\"description\" content=\"Uma explica\u00e7\u00e3o simples de como calcular uma m\u00e9dia m\u00f3vel exponencial em pandas, com um exemplo.\" \/>\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\/media-movel-exponencial-do-pandas\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Como calcular uma m\u00e9dia m\u00f3vel exponencial em Pandas\" \/>\n<meta property=\"og:description\" content=\"Uma explica\u00e7\u00e3o simples de como calcular uma m\u00e9dia m\u00f3vel exponencial em pandas, com um exemplo.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-28T03:48:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/ewmpandas1.png\" \/>\n<meta name=\"author\" content=\"Dr. benjamim anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr. benjamim anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\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\/pt\/media-movel-exponencial-do-pandas\/\",\"url\":\"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/\",\"name\":\"Como calcular uma m\u00e9dia m\u00f3vel exponencial em Pandas\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-28T03:48:36+00:00\",\"dateModified\":\"2023-07-28T03:48:36+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Uma explica\u00e7\u00e3o simples de como calcular uma m\u00e9dia m\u00f3vel exponencial em pandas, com um exemplo.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/media-movel-exponencial-do-pandas\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Como calcular uma m\u00e9dia m\u00f3vel exponencial em pandas\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/pt\/#website\",\"url\":\"https:\/\/statorials.org\/pt\/\",\"name\":\"Statorials\",\"description\":\"O seu guia para a literacia estat\u00edstica!\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/pt\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-PT\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\",\"name\":\"Dr. benjamim anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"pt-PT\",\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"https:\/\/statorials.org\/pt\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr. benjamim anderson\"},\"description\":\"Ol\u00e1, sou Benjamin, um professor aposentado de estat\u00edstica que se tornou professor dedicado na Statorials. 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