CosmoCoffee

Hi,

I am facing a question when running the importance sampling within CosmoMC. I would like to compute the new likelihood at all pre-sampled chain steps. How do I need to define the "redo_indep" parameter in this case? Or do I need to change something else as well?

From other CosmoCoffee comments, it sounded as if this was possible, but the best I can achieve is using only every tenth step...


cheers and many thanks in advance,
Katharina

If you are using stored .data files, the initial run needs to be done with indep_sample=1 to store everything for importance sampling.

You can also importance sample from text chain files (recomputing everything as needed), using redo_from_text=T. However the main advantage of importance sampling is that either you can thin (which loses little information) or you don't have to recompute things.