{"id":8367,"date":"2019-01-05T20:51:23","date_gmt":"2019-01-05T18:51:23","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=8367"},"modified":"2019-12-25T11:06:31","modified_gmt":"2019-12-25T09:06:31","slug":"how-to-create-histogram-by-group-in-r","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/how-to-create-histogram-by-group-in-r\/","title":{"rendered":"How to Create Histogram by Group in R"},"content":{"rendered":"<div id=\"rdoc\">\n<p>In this article, you will learn how to easily create a <strong>histogram by group<\/strong> in R using the ggplot2 package.<\/p>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div class='dt-sc-ico-content type1'><div class='custom-icon' ><a href='https:\/\/www.datanovia.com\/en\/product\/ggplot2-essentials-for-great-data-visualization-in-r\/' target='_blank'><span class='fa fa-book'><\/span><\/a><\/div><h4><a href='https:\/\/www.datanovia.com\/en\/product\/ggplot2-essentials-for-great-data-visualization-in-r\/' target='_blank'> Related Book <\/a><\/h4>GGPlot2 Essentials for Great Data Visualization in R<\/div>\n<div class='dt-sc-hr-invisible-medium  '><\/div>\n<div id=\"prerequisites\" class=\"section level2\">\n<h2>Prerequisites<\/h2>\n<ul>\n<li>Load the ggplot2 package and set the theme function <code>theme_classic()<\/code> as the default theme:<\/li>\n<\/ul>\n<pre class=\"r\"><code>library(ggplot2)\r\ntheme_set(\r\n  theme_classic() + \r\n    theme(legend.position = \"top\")\r\n  )<\/code><\/pre>\n<ul>\n<li>Create a demo dataset: Weight data by sex:<\/li>\n<\/ul>\n<pre class=\"r\"><code>set.seed(1234)\r\nwdata = data.frame(\r\n        sex = factor(rep(c(\"F\", \"M\"), each=200)),\r\n        weight = c(rnorm(200, 55), rnorm(200, 58))\r\n        )\r\n\r\nhead(wdata, 4)<\/code><\/pre>\n<pre><code>##   sex weight\r\n## 1   F   53.8\r\n## 2   F   55.3\r\n## 3   F   56.1\r\n## 4   F   52.7<\/code><\/pre>\n<\/div>\n<div id=\"create-histogram-by-group\" class=\"section level2\">\n<h2>Create histogram by group<\/h2>\n<pre class=\"r\"><code># Change line color by sex\r\nggplot(wdata, aes(x = weight)) +\r\n  geom_histogram(aes(color = sex), fill = \"white\",\r\n                position = \"identity\", bins = 30) +\r\n  scale_color_manual(values = c(\"#00AFBB\", \"#E7B800\")) \r\n\r\n\r\n# change fill and outline color manually \r\nggplot(wdata, aes(x = weight)) +\r\n  geom_histogram(aes(color = sex, fill = sex), \r\n                position = \"identity\", bins = 30, alpha = 0.4) +\r\n  scale_color_manual(values = c(\"#00AFBB\", \"#E7B800\")) +\r\n  scale_fill_manual(values = c(\"#00AFBB\", \"#E7B800\"))<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/117-r-histogram-by-group-examples-1.png\" width=\"288\" \/><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/ggplot2\/figures\/117-r-histogram-by-group-examples-2.png\" width=\"288\" \/><\/p>\n<\/div>\n<\/div>\n<p><!--end rdoc--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this article, you will learn how to easily create a histogram by group in R using the ggplot2 package. Prerequisites Load the ggplot2 package and set the theme function [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":7916,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[124],"tags":[131],"class_list":["post-8367","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ggplot2","tag-ggplot2-faq"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to Create Histogram by Group in R - Datanovia<\/title>\n<meta name=\"description\" content=\"In this article, you will learn how to easily create a histogram by group in R using the ggplot2 package.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.datanovia.com\/en\/blog\/how-to-create-histogram-by-group-in-r\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Create Histogram by Group in R - 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