Overwrite the subdataframes made with a for loop

General Usage Performance
8

Sorry! DataFramesMeta.jl recently made the change to have :x on the LHS instead of x. This will work

using DataFramesMeta

 function analysis_ID_better(df::AbstractDataFrame)
    @chain df begin 
        groupby(:ID)
        @combine Count_sum = sum(:Count)
    end
end