Ignoring NaNs when calculating means of columns of a dataframe

General Usage
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2

There is a package SkipNan which might help. Look at the following example:

julia> using SkipNan

julia> skipnan([1.0, NaN, 2.0])
skipnan([1.0, NaN, 2.0])

julia> mean(skipnan([1.0, NaN, 2.0]))
1.5
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