6.1 Describing one variable

The count() function in tidyverse creates a tibble with each value of the variable and the “count” of observations within.

# Frequency table
  Tab =
    film %>%   # the dataset
    count(SubjectSex) # the variable to count
  
  Tab

## # A tibble: 2 x 2
##   SubjectSex     n
## * <chr>      <int>
## 1 Female       177
## 2 Male         584

Calculating the the percent of total cases in each category (relative frequency) requires an extra line of code (mutate(Percent = 100 * n/sum(n))).

# Relative frequency
  Tab = 
    Tab %>%
    mutate(Percent = 100 * n/sum(n))
  
  Tab

## # A tibble: 2 x 3
##   SubjectSex     n Percent
## * <chr>      <int>   <dbl>
## 1 Female       177    23.3
## 2 Male         584    76.7

Use a basic barplot() to display the results saved into these objects (rawTab). Note the notation here is barplot(count ~ category, data):

  barplot(n ~ SubjectSex, Tab)

  barplot(Percent ~ SubjectSex, Tab)