fixup skipmissing_mean()

Co-authored-by: Maximilian-Stefan-Ernst <34346372+Maximilian-Stefan-Ernst@users.noreply.github.com>

Author: alyst

src/additional_functions/helper.jl

@@ -41,10 +41,8 @@ function get_observed(rowind, data, semobserved; args = (), kwargs = NamedTuple(
     return observed_vec
 end
 
-function skipmissing_mean(mat::AbstractMatrix)
-    means = [mean(skipmissing(coldata)) for coldata in eachcol(mat)]
-    return means
-end
+skipmissing_mean(mat::AbstractMatrix) = 
+    [mean(skipmissing(coldata)) for coldata in eachcol(mat)]
 
 function F_one_person(imp_mean, meandiff, inverse, data, logdet)
     F = logdet