Compute frequency or proportions on grouped dataframes

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10

And :b and :c at the same time can probably only really be handled by stacking them, because they don’t correspond to each other:

@chain dd begin
    stack([:b, :c])
    groupby([:a, :variable, :value])
    combine(nrow => :count)
end

7×4 DataFrame
 Row │ a       variable  value   count 
     │ String  String    String  Int64 
─────┼─────────────────────────────────
   1 │ a       b         no          2
   2 │ b       b         yes         1
   3 │ b       b         no          1
   4 │ a       c         lo          1
   5 │ b       c         lo          1
   6 │ a       c         hi          1
   7 │ b       c         hi          1
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