如何按几组汇总数据（R）

Question

I have a dataframe that looks like this:

And I want to get this, that is, a single row per Group, with a column for the % of As in all the ID_1_Subgroup for each Group, together with the sum of ValueSubgroup, for each group too):

Can someone help? I have seen other issues (like this: Summarizing by group and subgroup ) which are similar but not for R.

Answer 1

We can do

library(dplyr)
df1 %>%
     group_by(Group) %>%
     summarise(PercA = mean(id_1_Subgroup == "A"),
               SumOfValueSubgroup = sum(ValueSubgroup))