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](https://i.stack.imgur.com/hyRSJ.png)](https://i.stack.imgur.com/hyRSJ.png)

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