{"id":1641,"date":"2023-07-25T13:26:30","date_gmt":"2023-07-25T13:26:30","guid":{"rendered":"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/"},"modified":"2023-07-25T13:26:30","modified_gmt":"2023-07-25T13:26:30","slug":"ajuste-da-curva-r","status":"publish","type":"post","link":"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/","title":{"rendered":"Ajuste de curva em r (com exemplos)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">Muitas vezes voc\u00ea pode querer encontrar a equa\u00e7\u00e3o que melhor se ajusta a uma curva de R.<\/span> <\/p>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-16195\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courberaccordr1.png\" alt=\"Ajuste de curva em R\" width=\"405\" height=\"368\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">O exemplo passo a passo a seguir explica como ajustar curvas aos dados em R usando a fun\u00e7\u00e3o <strong>poly()<\/strong> e como determinar qual curva melhor se ajusta aos dados.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Etapa 1: criar e visualizar dados<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Vamos come\u00e7ar criando um conjunto de dados falso e, em seguida, criar um gr\u00e1fico de dispers\u00e3o para visualizar os dados:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create data frame\n<\/span>df &lt;- data. <span style=\"color: #3366ff;\">frame<\/span> (x=1:15,\n                 y=c(3, 14, 23, 25, 23, 15, 9, 5, 9, 13, 17, 24, 32, 36, 46))\n\n<span style=\"color: #008080;\">#create a scatterplot of x vs. y\n<\/span>plot(df$x, df$y, pch= <span style=\"color: #008000;\">19<\/span> , xlab=' <span style=\"color: #ff0000;\">x<\/span> ', ylab=' <span style=\"color: #ff0000;\">y<\/span> ')<\/strong> <\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16197 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbeajustementr0.png\" alt=\"\" width=\"411\" height=\"374\" srcset=\"\" sizes=\"auto, \"><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Etapa 2: ajustar m\u00faltiplas curvas<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Vamos ent\u00e3o ajustar v\u00e1rios modelos de regress\u00e3o polinomial aos dados e visualizar a curva de cada modelo no mesmo gr\u00e1fico:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\"><span style=\"color: #000000;\"><span style=\"color: #008080;\">#fit polynomial regression models up to degree 5\n<\/span>fit1 &lt;- lm(y~x, data=df)\nfit2 &lt;- lm(y~poly(x,2,raw= <span style=\"color: #008000;\">TRUE<\/span> ), data=df)\nfit3 &lt;- lm(y~poly(x,3,raw= <span style=\"color: #008000;\">TRUE<\/span> ), data=df)\nfit4 &lt;- lm(y~poly(x,4,raw= <span style=\"color: #008000;\">TRUE<\/span> ), data=df)\nfit5 &lt;- lm(y~poly(x,5,raw= <span style=\"color: #008000;\">TRUE<\/span> ), data=df)<\/span>\n\n#create a scatterplot of x vs. y\n<\/span>plot(df$x, df$y, pch=19, xlab=' <span style=\"color: #ff0000;\">x<\/span> ', ylab=' <span style=\"color: #ff0000;\">y<\/span> ')\n\n<span style=\"color: #008080;\">#define x-axis values\n<\/span>x_axis &lt;- seq(1, 15, length= <span style=\"color: #008000;\">15<\/span> )\n\n<span style=\"color: #008080;\">#add curve of each model to plot\n<\/span>lines(x_axis, predict(fit1, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">green<\/span> ')\nlines(x_axis, predict(fit2, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">red<\/span> ')\nlines(x_axis, predict(fit3, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">purple<\/span> ')\nlines(x_axis, predict(fit4, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">blue<\/span> ')\nlines(x_axis, predict(fit5, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">orange<\/span> ')\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\" wp-image-16198 aligncenter\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courbeajustementr2.png\" alt=\"\" width=\"416\" height=\"375\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\">Para determinar qual curva melhor se ajusta aos dados, podemos observar o <a href=\"https:\/\/statorials.org\/pt\/r-quadrados-em-r-se-ajusta\/\" target=\"_blank\" rel=\"noopener\">R quadrado ajustado<\/a> de cada modelo.<\/span><\/p>\n<p> <span style=\"color: #000000;\">Este valor nos diz a porcentagem de varia\u00e7\u00e3o na vari\u00e1vel resposta que pode ser explicada pela(s) vari\u00e1vel(\u00f5es) preditora(s) no modelo, ajustada pelo n\u00famero de vari\u00e1veis preditoras.<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#calculated adjusted R-squared of each model\n<\/span>summary(fit1)$adj. <span style=\"color: #3366ff;\">r<\/span> . <span style=\"color: #3366ff;\">squared<\/span>\nsummary(fit2)$adj. <span style=\"color: #3366ff;\">r<\/span> . <span style=\"color: #3366ff;\">squared<\/span>\nsummary(fit3)$adj. <span style=\"color: #3366ff;\">r<\/span> . <span style=\"color: #3366ff;\">squared<\/span>\nsummary(fit4)$adj. <span style=\"color: #3366ff;\">r<\/span> . <span style=\"color: #3366ff;\">squared<\/span>\nsummary(fit5)$adj. <span style=\"color: #3366ff;\">r<\/span> . <span style=\"color: #3366ff;\">squared<\/span>\n\n[1] 0.3144819\n[1] 0.5186706\n[1] 0.7842864\n[1] 0.9590276\n[1] 0.9549709\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Pelo resultado, podemos perceber que o modelo com maior R-quadrado ajustado \u00e9 o polin\u00f4mio de quarto grau, que possui um R-quadrado ajustado de <strong>0,959<\/strong> .<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Passo 3: Visualize a curva final<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">Finalmente, podemos criar um gr\u00e1fico de dispers\u00e3o com a curva do modelo polinomial de quarto grau:<\/span> <\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#create a scatterplot of x vs. y\n<\/span>plot(df$x, df$y, pch=19, xlab=' <span style=\"color: #ff0000;\">x<\/span> ', ylab=' <span style=\"color: #ff0000;\">y<\/span> ')\n\n<span style=\"color: #008080;\">#define x-axis values\n<\/span>x_axis &lt;- seq(1, 15, length= <span style=\"color: #008000;\">15<\/span> )\n\n<span style=\"color: #008080;\">#add curve of fourth-degree polynomial model\n<\/span>lines(x_axis, predict(fit4, data. <span style=\"color: #3366ff;\">frame<\/span> (x=x_axis)), col=' <span style=\"color: #ff0000;\">blue<\/span> ')\n<\/strong><\/pre>\n<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter wp-image-16195\" src=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courberaccordr1.png\" alt=\"Ajuste de curva em R\" width=\"405\" height=\"368\" srcset=\"\" sizes=\"auto, \"><\/p>\n<p> <span style=\"color: #000000;\"><span style=\"color: #000000;\">Tamb\u00e9m podemos obter a equa\u00e7\u00e3o desta linha usando a fun\u00e7\u00e3o <strong>summary()<\/strong> :<\/span><\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>summary(fit4)\n\nCall:\nlm(formula = y ~ poly(x, 4, raw = TRUE), data = df)\n\nResiduals:\n    Min 1Q Median 3Q Max \n-3.4490 -1.1732 0.6023 1.4899 3.0351 \n\nCoefficients:\n                         Estimate Std. Error t value Pr(&gt;|t|)    \n(Intercept) -26.51615 4.94555 -5.362 0.000318 ***\npoly(x, 4, raw = TRUE)1 35.82311 3.98204 8.996 4.15e-06 ***\npoly(x, 4, raw = TRUE)2 -8.36486 0.96791 -8.642 5.95e-06 ***\npoly(x, 4, raw = TRUE)3 0.70812 0.08954 7.908 1.30e-05 ***\npoly(x, 4, raw = TRUE)4 -0.01924 0.00278 -6.922 4.08e-05 ***\n---\nSignificant. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1\n\nResidual standard error: 2.424 on 10 degrees of freedom\nMultiple R-squared: 0.9707, Adjusted R-squared: 0.959 \nF-statistic: 82.92 on 4 and 10 DF, p-value: 1.257e-07\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">A equa\u00e7\u00e3o da curva \u00e9 a seguinte:<\/span><\/p>\n<p> <span style=\"color: #000000;\">y = -0,0192x <sup>4<\/sup> + 0,7081x <sup>3<\/sup> \u2013 8,3649x <sup>2<\/sup> + 35,823x \u2013 26,516<\/span><\/p>\n<p> <span style=\"color: #000000;\">Podemos usar esta equa\u00e7\u00e3o para prever o valor da <a href=\"https:\/\/statorials.org\/pt\/respostas-explicativas-das-variaveis\/\" target=\"_blank\" rel=\"noopener\">vari\u00e1vel de resposta<\/a> com base nas vari\u00e1veis preditoras do modelo. Por exemplo, se <em>x<\/em> = 4, ent\u00e3o prever\u00edamos que <em>y<\/em> = <strong>23,34<\/strong> :<\/span><\/p>\n<p> <span style=\"color: #000000;\">y = -0,0192(4) <sup>4<\/sup> + 0,7081(4) <sup>3<\/sup> \u2013 8,3649(4) <sup>2<\/sup> + 35,823(4) \u2013 26,516 = 23,34<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Recursos adicionais<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/pt\/regressao-polinomial-1\/\" target=\"_blank\" rel=\"noopener\">Uma introdu\u00e7\u00e3o \u00e0 regress\u00e3o polinomial<br \/><\/a> <a href=\"https:\/\/statorials.org\/pt\/regressao-polinomial-r\/\" target=\"_blank\" rel=\"noopener\">Regress\u00e3o Polinomial em R (Passo a Passo)<\/a><br \/> <a href=\"https:\/\/statorials.org\/pt\/funcao-seq-em-r\/\">Como usar a fun\u00e7\u00e3o seq em R<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Muitas vezes voc\u00ea pode querer encontrar a equa\u00e7\u00e3o que melhor se ajusta a uma curva de R. O exemplo passo a passo a seguir explica como ajustar curvas aos dados em R usando a fun\u00e7\u00e3o poly() e como determinar qual curva melhor se ajusta aos dados. Etapa 1: criar e visualizar dados Vamos come\u00e7ar criando [&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-1641","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>Ajuste de curva em R (com exemplos) - Statorials<\/title>\n<meta name=\"description\" content=\"Este tutorial explica como ajustar uma curva a uma nuvem de pontos em R, 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\/ajuste-da-curva-r\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ajuste de curva em R (com exemplos) - Statorials\" \/>\n<meta property=\"og:description\" content=\"Este tutorial explica como ajustar uma curva a uma nuvem de pontos em R, com v\u00e1rios exemplos.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T13:26:30+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/statorials.org\/wp-content\/uploads\/2023\/08\/courberaccordr1.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=\"3 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/\",\"url\":\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/\",\"name\":\"Ajuste de curva em R (com exemplos) - Statorials\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/pt\/#website\"},\"datePublished\":\"2023-07-25T13:26:30+00:00\",\"dateModified\":\"2023-07-25T13:26:30+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/pt\/#\/schema\/person\/e08f98e8db95e0aa9c310e1b27c9c666\"},\"description\":\"Este tutorial explica como ajustar uma curva a uma nuvem de pontos em R, com v\u00e1rios exemplos.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/#breadcrumb\"},\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/pt\/ajuste-da-curva-r\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Lar\",\"item\":\"https:\/\/statorials.org\/pt\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Ajuste de curva em r (com exemplos)\"}]},{\"@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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