CODEWITHSUNDEEP
juliamissing-data
Julia Learner
Julia Learner

Reputation: 2902

In Julia: Find the mean of an array with missing values

The Statistics package mean function returns missing if any elements of an array are missing.

julia> using Statistics
julia> mean([1 2 3 4 5] )
3.0
julia> mean([1 2 missing 4 5] )  # Note missing value
missing

How do I get the mean of the non-missing values?

Upvotes: 5

Views: 3708

Answers (1)

Julia Learner
Julia Learner

Reputation: 2902

The skipmissing function will send only the non-missing elements to the mean function:

julia> using Statistics
julia> mean([1 2 3 4 5] )
3.0https://docs.julialang.org/en/stable/manual/missing/#Skipping-Missing-Values-1
julia> mean([1 2 missing 4 5] )  # Note missing value
missing
# Here is the answer:
julia> mean(skipmissing([1 2 missing 4 missing] ))
2.3333333333333335

As pointed out by @Milan Bouchet-Valat in a comment to the question, the docs on missing are here. They are a good quick, first read on Julia's handling of missing values.

Upvotes: 6

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