User-defined objective function with scalar and vector inputs

Specific Domains Optimization (Mathematical)
4

I think your function has to return a Float64 instead of an Int. Try this:

# These shouldn't be inside the function or you have to read the 
# data frame _every_ time it gets called!!!
const df = CSV.read("data_estimation.csv", DataFrame; header=true)
const n = nrow(df)

function likelihood(ρ::T, α::T, fB::T, fS::T, fO::T, δ::T...) where {T}
    sum = zero(T)
    for i in 1:n
        # ...
    end
    return -sum
end

Also: please read Please read: make it easier to help you. It’s easier to help if you post a minimal working example demonstrating the error.

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