How can I in R, group by ID and summarise by mean with na.rm = TRUE

Question

I want to group by ID and summarise, whilst removing NAs. please see example code below.

# Example data
ID <- c(1, 1, 1, 2, 2, 3, 3)
x <- c(2, 3, NA, 2, 3, 1, 1)
ID_x <- tibble(ID, x)

# 1. Works
ID_x %>%
  group_by(ID) %>% 
  summarise_each(mean)

# 2. Does not work with na.rm=TRUE
ID_x %>%
  group_by(ID) %>% 
  summarise_each(mean(., na.rm=TRUE))

Thanks in advance

Answer 1

Use the lambda (~

library(dplyr)
ID_x %>%
  group_by(ID) %>% 
  summarise_each(~ mean(., na.rm=TRUE))

-output

# A tibble: 3 × 2
     ID     x
  <dbl> <dbl>
1     1   2.5
2     2   2.5
3     3   1  

---

Also, in recent versions, the summarise_each will accompany a warning as these are deprecated in favor of across

ID_x %>%
  group_by(ID) %>% 
  summarise(across(everything(), ~ mean(., na.rm=TRUE)))

Answer 2

A different option would be using funs. You can also use this:

ID_x %>%
  group_by(ID) %>% 
  summarise_each(funs(mean(., na.rm = TRUE)))

Output:

# A tibble: 3 × 2
     ID     x
  <dbl> <dbl>
1     1   2.5
2     2   2.5
3     3   1