It is relatively straightforward to build a histogram with
ggplot2 thanks to the
geom_histogram() function. Only one numeric variable is needed in the input. Note that a warning message is triggered with this code: we need to take care of the bin width as explained in the next section.
A histogram takes as input a numeric variable and cuts it into several bins. Playing with the bin size is a very important step, since its value can have a big impact on the histogram appearance and thus on the message you’re trying to convey. This concept is explained in depth in data-to-viz.
Ggplot2 makes it a breeze to change the bin size thanks to the
binwidth argument of the
geom_histogram function. See below the impact it can have on the output.
# Libraries library(tidyverse) library(hrbrthemes) # Load dataset from github data <- read.table("https://raw.githubusercontent.com/holtzy/data_to_viz/master/Example_dataset/1_OneNum.csv", header=TRUE) # plot p <- data %>% filter( price<300 ) %>% ggplot( aes(x=price)) + geom_histogram( binwidth=3, fill="#69b3a2", color="#e9ecef", alpha=0.9) + ggtitle("Bin size = 3") + theme_ipsum() + theme( plot.title = element_text(size=15) ) #p