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

You could use tidyr with dplyr

library(dplyr)
library(tidyr)

 df %>%
 gather(observation, Val, obs1:obs2) %>% 
 group_by(owner,observation, Val) %>% 
 summarise(n= n()) %>%
 ungroup() %>%
 spread(Val, n, fill=0)

which gives the output

  #    owner observation loud quiet
  #1     0        obs1    1     1
  #2     0        obs2    2     0
  #3     1        obs1    1     1
  #4     1        obs2    0     2