Extracting the likelihood function with cobaya

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Helena Garcia
Posts: 17
Joined: October 05 2021
Affiliation: UCI

Extracting the likelihood function with cobaya

Post by Helena Garcia » February 08 2022

I would like to know if it is possible to extract the likelihood function for the best fit value of a converged chain with cobaya. I haven't found any information in the documentation and would like to know if it's possible. Thank you in advanced!

Antony Lewis
Posts: 1842
Joined: September 23 2004
Affiliation: University of Sussex
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Re: Extracting the likelihood function with cobaya

Post by Antony Lewis » February 08 2022

Not sure what you are asking. GetDist can report the best-fit sample likelihood value.

Helena Garcia
Posts: 17
Joined: October 05 2021
Affiliation: UCI

Re: Extracting the likelihood function with cobaya

Post by Helena Garcia » February 09 2022

I would like to extract the likelihood function in order to compare the minimization result I'm obtaining using the BOBQYA method implemented in minimizer sampler of cobaya with a different one. The results I'm getting are not consistent as when I increase the degrees of freedom of my chains (I'm running nested models) the models get worse. GetDist can report the best-fit sample likelihood value but I need a function. Do you know if I can obtain this function?

Antony Lewis
Posts: 1842
Joined: September 23 2004
Affiliation: University of Sussex
Contact:

Re: Extracting the likelihood function with cobaya

Post by Antony Lewis » February 10 2022

You can call the likelihood with the parameters of the best-fit point if that's what you mean.

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