Copula: Log-likelihood, AIC, BIC

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Elena
Elena on 22 Oct 2013
Edited: kantha vel on 10 Sep 2018
Dear All, I am trying to estimate the best copula and have read that one approach is to compare log-likelihood and some information criteria (AIC, BIC). But I can not calculate them, also in the examples provided there is no info how to proceed. Help please... Would be very grateful! Thanks in advance.
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Antonio
Antonio on 20 Sep 2014
I have the same question, I have two dataset that are distributed following a Normal Distribution, after using the normcdf to make them Uniform, afterwards, I use the copulafit comamand to fit with the different families of copulas, and now I would like to check which is the one that adapt better, in order to measure the dependence among the data.
I guess that AIC and BIC are the best way to deal with this, but I do not know how to implement them.

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Answers (1)

M Bateni
M Bateni on 23 Jun 2016
You can go to the body of built-in file 'copulafit' by typing 'edit copulafit' in the command window. At the end of the body of that function, there are some sub-functions starting with "negloglike" like 'negloglike_clayton'. By using those functions out of 'copulafit', you can have negative likelihood values for different copula families. having this value, you can easily calculate AIC or BIC (maybe using 'aicbic' function).
  2 Comments
Lazola Ngcengula
Lazola Ngcengula on 3 May 2017
Thanks very much man, this works perfectly after a few modifications of course.
kantha vel
kantha vel on 10 Sep 2018
Edited: kantha vel on 10 Sep 2018
Hi friend Lazola Can you send that code?

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