{"id":16875,"date":"2020-06-09T20:51:13","date_gmt":"2020-06-09T19:51:13","guid":{"rendered":"https:\/\/www.datanovia.com\/en\/?p=16875"},"modified":"2020-06-09T20:51:37","modified_gmt":"2020-06-09T19:51:37","slug":"ggplot-histogram-with-density-curve-in-r-using-secondary-y-axis","status":"publish","type":"post","link":"https:\/\/www.datanovia.com\/en\/blog\/ggplot-histogram-with-density-curve-in-r-using-secondary-y-axis\/","title":{"rendered":"GGPLOT Histogram with Density Curve in R using Secondary Y-axis"},"content":{"rendered":"<div id=\"rdoc\">\n<p>In this article, you will learn how to easily create a <strong>ggplot histogram with density curve in R<\/strong> using a secondary y-axis. We\u2019ll use the <code>ggpubr<\/code> package to create the plots and the <code>cowplot<\/code> package to align the graphs.<\/p>\n<p>Contents:<\/p>\n<div id=\"TOC\">\n<ul>\n<li><a href=\"#prerequisites\">Prerequisites<\/a><\/li>\n<li><a href=\"#data-preparation\">Data preparation<\/a><\/li>\n<li><a href=\"#create-histogram-with-density-distribution-on-the-same-y-axis\">Create histogram with density distribution on the same y axis<\/a><\/li>\n<li><a href=\"#using-a-secondary-y-axis-for-the-density-distribution\">Using a secondary y-axis for the density distribution<\/a><\/li>\n<li><a href=\"#conclusion\">Conclusion<\/a><\/li>\n<\/ul>\n<\/div>\n<div id=\"prerequisites\" class=\"section level2\">\n<h2>Prerequisites<\/h2>\n<p>Load the required R packages:<\/p>\n<pre class=\"r\"><code>library(ggpubr)\r\nlibrary(cowplot)<\/code><\/pre>\n<\/div>\n<div id=\"data-preparation\" class=\"section level2\">\n<h2>Data preparation<\/h2>\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\nhead(wdata)<\/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\r\n## 5   F   55.4\r\n## 6   F   55.5<\/code><\/pre>\n<\/div>\n<div id=\"create-histogram-with-density-distribution-on-the-same-y-axis\" class=\"section level2\">\n<h2>Create histogram with density distribution on the same y axis<\/h2>\n<pre class=\"r\"><code># Basic histogram without the density curve\r\ngghistogram(\r\n  wdata, x = \"weight\", \r\n  add = \"mean\", rug = TRUE,\r\n  fill = \"sex\", palette = c(\"#00AFBB\", \"#E7B800\")\r\n  )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/r-tutorial\/figures\/ggplot-histogram-with-density-curve-in-r-plot-with-one-y-axis-1.png\" width=\"480\" \/><\/p>\n<pre class=\"r\"><code># Add the density curve on the same axis\r\ngghistogram(\r\n  wdata, x = \"weight\", y = \"..density..\",\r\n  add = \"mean\", rug = TRUE,\r\n  fill = \"sex\", palette = c(\"#00AFBB\", \"#E7B800\"),\r\n  add_density = TRUE\r\n  )<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/r-tutorial\/figures\/ggplot-histogram-with-density-curve-in-r-plot-with-one-y-axis-2.png\" width=\"480\" \/><\/p>\n<\/div>\n<div id=\"using-a-secondary-y-axis-for-the-density-distribution\" class=\"section level2\">\n<h2>Using a secondary y-axis for the density distribution<\/h2>\n<pre class=\"r\"><code># 1. Create the histogram plot\r\nphist &lt;- gghistogram(\r\n  wdata, x = \"weight\", \r\n  add = \"mean\", rug = TRUE,\r\n  fill = \"sex\", palette = c(\"#00AFBB\", \"#E7B800\")\r\n)\r\n\r\n# 2. Create the density plot with y-axis on the right\r\n# Remove x axis elements\r\npdensity &lt;- ggdensity(\r\n  wdata, x = \"weight\", \r\n  color= \"sex\", palette = c(\"#00AFBB\", \"#E7B800\"),\r\n  alpha = 0\r\n) +\r\n  scale_y_continuous(expand = expansion(mult = c(0, 0.05)), position = \"right\")  +\r\n  theme_half_open(11, rel_small = 1) +\r\n  rremove(\"x.axis\")+\r\n  rremove(\"xlab\") +\r\n  rremove(\"x.text\") +\r\n  rremove(\"x.ticks\") +\r\n  rremove(\"legend\")\r\n\r\n# 3. Align the two plots and then overlay them.\r\naligned_plots &lt;- align_plots(phist, pdensity, align=\"hv\", axis=\"tblr\")\r\nggdraw(aligned_plots[[1]]) + draw_plot(aligned_plots[[2]])<\/code><\/pre>\n<p><img decoding=\"async\" src=\"https:\/\/www.datanovia.com\/en\/wp-content\/uploads\/dn-tutorials\/r-tutorial\/figures\/ggplot-histogram-with-density-curve-in-r-using-secondary-y-axis-1.png\" width=\"480\" \/><\/p>\n<\/div>\n<div id=\"conclusion\" class=\"section level2\">\n<h2>Conclusion<\/h2>\n<p>This article describes how to create a ggplot histogram with density curve in R using a secondary y-axis<\/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 ggplot histogram with density curve in R using a secondary y-axis. We\u2019ll use the ggpubr package to create the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":16876,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"rating_form_position":"","rating_results_position":"","mr_structured_data_type":"","footnotes":""},"categories":[341,124],"tags":[343],"class_list":["post-16875","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-faq","category-ggplot2","tag-ggpubr"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>GGPLOT Histogram with Density Curve in R using Secondary Y-axis - Datanovia<\/title>\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\/ggplot-histogram-with-density-curve-in-r-using-secondary-y-axis\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"GGPLOT Histogram with Density Curve in R using Secondary Y-axis - Datanovia\" \/>\n<meta property=\"og:description\" content=\"In this article, you will learn how to easily create a ggplot histogram with density curve in R using a secondary y-axis. 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