Histograms and Density Plots in ggplot2

Now you will learn the ggplot2 syntax for building and customizing histograms.

Introduction

This R tutorial describes how to create a histogram plot using R software and ggplot2 package.

The function geom_histogram() is used. You can also add a line for the mean using the function geom_vline.



Prepare the data

The data below will be used :

set.seed(1234)
df <- data.frame(
  sex=factor(rep(c("F", "M"), each=200)),
  weight=round(c(rnorm(200, mean=55, sd=5), rnorm(200, mean=65, sd=5)))
  )
head(df)
##   sex weight
## 1   F     49
## 2   F     56
## 3   F     60
## 4   F     43
## 5   F     57
## 6   F     58

Source: STHDA, http://www.sthda.com/english/wiki/ggplot2-histogram-plot-quick-start-guide-r-software-and-data-visualization
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