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r - summerize NA, count BY GROUP

I have this data frame for the test:

test_df <- structure(list(plant_sp = c("plant_1", "plant_1", "plant_2", "plant_2", "plant_3",
                                       "plant_3", "plant_3", "plant_3", "plant_3", "plant_4", 
                                       "plant_4", "plant_4", "plant_4", "plant_4", "plant_4",
                                       "plant_5", "plant_5", "plant_5", "plant_5", "plant_5"), 
                          sp_rich = c(1, 1, NA, 1, NA, 
                                      1, 0, 0, NA, 0,
                                      0, 1, 0, 0, 1, 
                                      0, NA, NA, 0,NA)), 
                     row.names = c(NA, -20L), class = "data.frame", 
                     .Names = c("plant_sp", "sp_rich"))

I want to create a new data frame that has a sammerize data out of this data:

the df I need

which indicates the count and NA in each group (for example in group plant_1 there are only 2 "1" in the group and 0 "NA"

can you help me? thanks Ido


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1 Answer

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by (71.8m points)

This should work

library(dplyr)

test_df %>%
  group_by(plant_sp) %>%
  summarize(count = sum(sp_rich > 0 & !is.na(sp_rich)),
            miss = sum(is.na(sp_rich)))

# A tibble: 5 x 3
  plant_sp count  miss
  <chr>    <int> <int>
1 plant_1      2     0
2 plant_2      1     1
3 plant_3      1     2
4 plant_4      2     0
5 plant_5      0     3

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