7 Histograms

Using the ggplot2::geom_histogram() function

library(tidyverse)       # super helpful everything, including ggplot

Reminder: Steps before the ggplot() are combined with pipes %>%, whereas layers of the plot are combined with the addition symbol +.

7.1 Single continuous variable

7.1.1 Default bins/binwidth

data_ihno %>% 
  ggplot(aes(phobia)) +
  geom_histogram()

7.1.2 Specify number of bins

data_ihno %>% 
  ggplot(aes(phobia)) +
  geom_histogram(bins = 6)

7.1.3 Specify bin width

data_ihno %>% 
  ggplot(aes(phobia)) +
  geom_histogram(binwidth = 1)

7.2 Fill in the color -by- a factor

data_ihno %>% 
  dplyr::mutate(phobia_cut3 = cut(phobia, 
                                  breaks = c(0, 2, 4, 10),
                                  include.lowest = TRUE)) %>% 
  ggplot(aes(phobia,
             fill = phobia_cut3)) +
  geom_histogram(binwidth = 1)