I am running the minimizer sampler in the standard LCDM case with CAMB using cobaya with the following parameter selections:
I have the following questions:
1.- Every time I ran the minimizer I got a different chi2, the delta chi2 can be as high as 6, is that normal?
2.- I tried to change the best_of parameter but if I set it to a number >10 the minimization breaks before giving an output. Can this parameter help reduce the error bars in the chi2 results? How can I get it to work for a best_of >10 run?
3.- The output file that I get has a chi-sq at the beginning that doesn't match the sum of chi2__CMB+chi2__BAO that I find at the end of the file, where does the difference come from?
Thanks!
Here are some of the input .yaml file block settings I am using:
I have the following questions:
1.- Every time I ran the minimizer I got a different chi2, the delta chi2 can be as high as 6, is that normal?
2.- I tried to change the best_of parameter but if I set it to a number >10 the minimization breaks before giving an output. Can this parameter help reduce the error bars in the chi2 results? How can I get it to work for a best_of >10 run?
3.- The output file that I get has a chi-sq at the beginning that doesn't match the sum of chi2__CMB+chi2__BAO that I find at the end of the file, where does the difference come from?
Thanks!
Here are some of the input .yaml file block settings I am using:
CODE:
sampler: minimize: method: bobyqa ignore_prior: true max_evals: 1e6d best_of: 2 confidence_for_unbounded: 0.9999995 seed: null override_scipy: null override_bobyqa: rhoend: 0.05 covmat: null covmat_params: null version: null fallback_covmat_scale: 4theory: camb: extra_args: halofit_version: mead bbn_predictor: PArthENoPE_880.2_standard.dat lens_potential_accuracy: 1 num_massive_neutrinos: 0 nnu: 3.044 theta_H0_range: - 20 - 100likelihood: planck_2018_lowl.TT: null planck_2018_lowl.EE: null planck_2018_highl_plik.TTTEEE: null planck_2018_lensing.clik: null bao.sdss_dr16_baoplus_lrg: null bao.sdss_dr16_baoplus_lyauto: null bao.sdss_dr16_baoplus_lyxqso: null bao.sdss_dr16_baoplus_qso: null bao.sdss_dr16_baoplus_elg: nullStatistics: Posted by Helena Garcia — February 20 2024