使用 dplyr 过滤、表格和排序？

Question

I'm trying to filter a variable by removing NA's, then table the variable, and then sort by descending. I've tried the following

library(dplyr)
df %>% filter(!is.na(var)) %>% data.frame(sort(table(var),decreasing=TRUE))

Any idea how to get this to work?

Answer 1

The pipe passes the result of the function call on the left as the first argument to the function on the right. Here you've tried to explicitly supply the argument to data.frame instead, so it will error. Instead, try this:

df %>%
  filter(!is.na(var)) %>%
  count(var) %>%
  arrange(desc(n))