[R] Fitting with Beta-prime

[aledanda]

Hi,

I need to fit my data with beta-prim distribution. I found the function in
the package VGAM: betaprime and betaff. I don't know how can I make it work.
I know that i need to calculate the parameters that describe this function
on my distribution. But for exemple I don't understand the "link function.
And then How can I plot my data fitted?

Can you help me out with this?

Thanks a lot!

Alessandra
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