CosmoMC June 2016: Flat contours using GetDist

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Luke Hart
Posts: 39
Joined: July 13 2015
Affiliation: University of Manchester

CosmoMC June 2016: Flat contours using GetDist

Post by Luke Hart » April 02 2017

I've added a parameter to the standard CosmoMC parametrization and when they converge, I'm getting flat contours where my new parameters are completely independent of the standard cosmology ones and then much narrower than the priors I set?

Any reason why my parameters could be marginalising to such a narrow final boundary?

Thanks for any help

Sunny Vagnozzi
Posts: 43
Joined: August 15 2016
Affiliation: Oskar Klein Centre, Stockholm University

CosmoMC June 2016: Flat contours using GetDist

Post by Sunny Vagnozzi » April 04 2017

Hi Luke! Could you please give some more details? E.g. what these parameters are (are they recombination parameters you are playing with?), what prior did you originally set, which datasets are you using, what level of convergence are you requiring?

Cheers,
Sunny

Luke Hart
Posts: 39
Joined: July 13 2015
Affiliation: University of Manchester

CosmoMC June 2016: Flat contours using GetDist

Post by Luke Hart » April 05 2017

Update: Found! It seems to have originated from the proposal distribution so I tweaked that a little bit and now it seems to be giving actual covariances rather than just remaining degenerate to the code.

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