Split-apply-combine error

New to Julia
1

Am I doing something wrong here with the quantile line? The 3rd line with mean runs, but I’m getting the empty data vector error with the 2nd line.

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image1051×92 10.9 KB

This is ultimately the way I want to run it, but it’s giving the empty data vector error here as well:

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2

Hard to say for certain without a minimum working example, but it looks like this:

julia> using DataFrames

julia> df = DataFrame(group = [1,1,2,2], val = [2, 3, missing, missing])
4×2 DataFrame
 Row │ group  val     
     │ Int64  Int64?  
─────┼────────────────
   1 │     1        2
   2 │     1        3
   3 │     2  missing 
   4 │     2  missing 

julia> combine(groupby(df, :group), :val => (x -> quantile(x, 0.5)) ∘ skipmissing)
ERROR: ArgumentError: empty data vector

i.e. you have groups which don’t have any dv_plasma observations, so there’s no data left to calculate the quantile from after skipmissing

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