summarizing counts of a factor with dplyr

Question

I want to group a data frame by a column (owner) and output a new data frame that has counts of each type of a factor at each observation. The real data frame is fairly larg

Answer 1

In 2017 the answer is

library(dplyr)
library(tidyr)

gather(df, key, value, -owner) %>%
  group_by(owner, key, value) %>%
  tally %>% 
  spread(value, n, fill = 0)

Which gives output

Source: local data frame [4 x 4]
Groups: owner, key [4]

  owner   key  loud quiet
*    
1     0  obs1     1     1
2     0  obs2     2     0
3     1  obs1     1     1
4     1  obs2     0     2

In 2019 the answer is:

gather(df, key, value, -owner) %>% 
    count(owner, key, value) %>% 
    spread(value, n, fill = 0)