Ideal parameters for SN dark energy analysis

[am610]

Hi, As I run some new SN data sets, but architecture is an exact replica of the JLA-simple design and guidelines, following this post #212 . I get some pretty weird results. I have N=50,000 and 4 loops, this is a first run, so I started off with this numbers to see the initial trend. My param file is copied below

`# Cosmological parameters list data.parameters['Omega_cdm'] = [0.2562, None, None, 0.008, 1, 'cosmo'] data.parameters['w0_fld'] = [ -1., -3.0, -0.334, 0.2, 1, 'cosmo'] data.parameters['w0wa'] = [ -1.0, -4., -0., 0.2, 1, 'cosmo']

"# Nuisance data.parameters['M'] = [-19.02, None, None, 0.004, 1, 'nuisance']

"# Derived parameter list data.parameters['Omega_m'] = [0, -1, 1, 0,1, 'derived']

data.cosmo_arguments['Omega_Lambda'] = 0 data.cosmo_arguments['Omega_b'] = 0.05`

I run this for two different datasets, except M, none of the cosmological parameters seems anchored around their true theoretical values. I know my data is ok. So my question is, what is it that I am doing wrong ? or simply I need to run more chains (but I would guess in this case, convergence won't be achieved for smaller chains, but the central tendency should be already visible)? or do I need to +- something in the param file list of variables ? thanks I am sharing couple of plots