https://juliastats.org/StatsBase.jl/v0.16/signalcorr.html#StatsBase.autocor
If x is a vector, return a vector of the same length as x.
julia> length(autocor(randn(2000)))
34
Why isn’t the result length 2000?
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https://juliastats.org/StatsBase.jl/stable/signalcorr/
" When left unspecified, the lags used are the integers from 0 to min(size(x,1)-1, 10*log10(size(x,1))) ."
julia> 10*log10(2000)
33.01029995663981
lag starting at 0 up to 33 gives 34 lags.
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