GetDist: samples.loglikes actually chi2?
Posted: July 02 2021
Hello,
I have been comparing samples.loglikes values with the logL values for the same chains read in with the 'anesthetic' package and find that getdist version gives values that are higher by a factor of 2. I also saw that in the getdist loadChains function loglikes are defined as "loglikes: if loading from arrays of samples, corresponding list of arrays of -2 log(likelihood)".
I have tried this logL getdist vs anesthetic comparison for chains produced with CosmoMC and nested sampling chains obtained with CosmoSIS and got the same result.
In all the documentation I was able to find samples.loglikes is described as -log(likelihood) or chi2/2 - is it at all possible that this might not be the case for certain chains or that I may have misunderstood the documentation somehow and samples.loglikes is actually -2log(likelihood) or chi2?
Sorry for perhaps a silly question but I would really appreciate a clarification!
Thanks a lot!
I have been comparing samples.loglikes values with the logL values for the same chains read in with the 'anesthetic' package and find that getdist version gives values that are higher by a factor of 2. I also saw that in the getdist loadChains function loglikes are defined as "loglikes: if loading from arrays of samples, corresponding list of arrays of -2 log(likelihood)".
I have tried this logL getdist vs anesthetic comparison for chains produced with CosmoMC and nested sampling chains obtained with CosmoSIS and got the same result.
In all the documentation I was able to find samples.loglikes is described as -log(likelihood) or chi2/2 - is it at all possible that this might not be the case for certain chains or that I may have misunderstood the documentation somehow and samples.loglikes is actually -2log(likelihood) or chi2?
Sorry for perhaps a silly question but I would really appreciate a clarification!
Thanks a lot!