Dropping missing values in dataframes

General Usage
2

Since you are modifying in-place, of course the element type of the container will remain the same. There are many solutions, eg

using DataFrames, StatsBase, Statistics
df = DataFrame(:age => Vector{Union{Float64,Missing}}(rand(100)))
df.age[sample(axes(df, 1), 10)] .= missing
df.age = replace(df.age, missing => median(skipmissing(df.age)))
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