move statistics from Base to StatsBase

this commit removes cor, cov, median, median!,
middle, quantile, quantile!, std, stdm, var,
varm and linreg and moves them to StatsBase

fix #25571 (comment) (included in StatsBase.jl/#379)
fix #23769 (included in StatsBase.jl/#379)
fix #27140

base/deprecated.jl

@@ -296,12 +296,6 @@ deprecate(Base, :DSP, 2)
 using .DSP
 export conv, conv2, deconv, filt, filt!, xcorr
 
-# PR #21709
-@deprecate cov(x::AbstractVector, corrected::Bool) cov(x, corrected=corrected)
-@deprecate cov(x::AbstractMatrix, vardim::Int, corrected::Bool) cov(x, dims=vardim, corrected=corrected)
-@deprecate cov(X::AbstractVector, Y::AbstractVector, corrected::Bool) cov(X, Y, corrected=corrected)
-@deprecate cov(X::AbstractVecOrMat, Y::AbstractVecOrMat, vardim::Int, corrected::Bool) cov(X, Y, dims=vardim, corrected=corrected)
-
 # PR #22325
 # TODO: when this replace is removed from deprecated.jl:
 # 1) rename the function replace_new from strings/util.jl to replace
@@ -1347,14 +1341,6 @@ export readandwrite
 @deprecate findmin(A::AbstractArray, dims)    findmin(A, dims=dims)
 
 @deprecate mean(A::AbstractArray, dims)                              mean(A, dims=dims)
-@deprecate varm(A::AbstractArray, m::AbstractArray, dims; kwargs...) varm(A, m; kwargs..., dims=dims)
-@deprecate var(A::AbstractArray, dims; kwargs...)                    var(A; kwargs..., dims=dims)
-@deprecate std(A::AbstractArray, dims; kwargs...)                    std(A; kwargs..., dims=dims)
-@deprecate cov(X::AbstractMatrix, dim::Int; kwargs...)               cov(X; kwargs..., dims=dim)
-@deprecate cov(x::AbstractVecOrMat, y::AbstractVecOrMat, dim::Int; kwargs...) cov(x, y; kwargs..., dims=dim)
-@deprecate cor(X::AbstractMatrix, dim::Int)                          cor(X, dims=dim)
-@deprecate cor(x::AbstractVecOrMat, y::AbstractVecOrMat, dim::Int)   cor(x, y, dims=dim)
-@deprecate median(A::AbstractArray, dims; kwargs...)                 median(A; kwargs..., dims=dims)
 
 @deprecate mapreducedim(f, op, A::AbstractArray, dims)     mapreduce(f, op, A, dims=dims)
 @deprecate mapreducedim(f, op, A::AbstractArray, dims, v0) mapreduce(f, op, v0, A, dims=dims)
@@ -1664,6 +1650,20 @@ end
 # when this is removed, `isbitstype(typeof(x))` can be replaced with `isbits(x)`
 @deprecate isbits(@nospecialize(t::Type)) isbitstype(t)
 
+# statistics to StatsBase (#27152)
+@deprecate_moved cor "StatsBase"
+@deprecate_moved cov "StatsBase"
+@deprecate_moved median "StatsBase"
+@deprecate_moved median! "StatsBase"
+@deprecate_moved middle "StatsBase"
+@deprecate_moved quantile "StatsBase"
+@deprecate_moved quantile! "StatsBase"
+@deprecate_moved std "StatsBase"
+@deprecate_moved stdm "StatsBase"
+@deprecate_moved var "StatsBase"
+@deprecate_moved varm "StatsBase"
+@deprecate_moved linreg "StatsBase"
+
 # Special string deprecation
 @deprecate start(s::AbstractString) firstindex(s)
 @deprecate next(s::AbstractString, i::Integer) iterate(s, i)

base/exports.jl

@@ -633,19 +633,8 @@ export
     set_zero_subnormals,
 
 # statistics
-    cor,
-    cov,
     mean!,
     mean,
-    median!,
-    median,
-    middle,
-    quantile!,
-    quantile,
-    std,
-    stdm,
-    var,
-    varm,
 
 # iteration
     done,

base/range.jl

@@ -854,8 +854,6 @@ function mean(r::AbstractRange{<:Real})
     (first(r) + last(r)) / 2
 end
 
-median(r::AbstractRange{<:Real}) = mean(r)
-
 function _in_range(x, r::AbstractRange)
     if step(r) == 0
         return !isempty(r) && first(r) == x