convergence issue

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Nishanth Sasankan
Posts: 27
Joined: September 07 2016
Affiliation: university of notre dame

convergence issue

Post by Nishanth Sasankan » January 03 2018

Hi ,
I been running CosmoMC and R-1 was about 0.078 the next time it was updated R-1 was 0.059 the next time it was 0.045. Is it usual to see that the drops in R-1 slow down like this between updates. The reason I ask is because the first time it was about 15, then it became 7 and then it was 1.7.

Is it Possible that some chain is just taking its time while others have converged.


Antony Lewis
Posts: 1543
Joined: September 23 2004
Affiliation: University of Sussex

Re: convergence issue

Post by Antony Lewis » January 04 2018

You mean the values in the .log file? Doesn't sound too bad, won't converge so dramatically once the chains are all exploring the same area.

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