Frequency Counts

Last updated: January 18, 2021

Frequency counts for a single categorical variable

df %>% count(smoke)

# A tibble: 2 x 2
#   smoke     n
#   <int> <int>
# 1     0   115
# 2     1    74

Frequency counts for combinations of variables

df %>%
  group_by(smoke, low) %>% 
  summarize(n = n())

  # A tibble: 4 x 3
# Groups:   smoke [2]
#   smoke   low     n
#   <int> <int> <int>
# 1     0     0    86
# 2     0     1    29
# 3     1     0    44
# 4     1     1    30

Setup for running the example code

This example uses the birthwt dataset. If you want to run the example code, first run this:

library(MASS) # Needed for `birthwt` dataset
library(tidyverse)
df <- birthwt # Information: https://stat.ethz.ch/R-manual/R-devel/library/MASS/html/birthwt.html

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