CosmoFit.S8Likelihood

class CosmoFit.S8Likelihood(cosmology, version='kids1000')

Bases: BaseLikelihood

A single Gaussian S8 = sigma8 * sqrt(Omega_m / 0.3) constraint from a weak-lensing survey (default: KiDS-1000; also DES Y3 – see load_s8()).

Don’t combine "s8" with a different version in the same fit – KiDS-1000 and DES Y3 are independent, not a single joint constraint; pass dataset_kwargs={"s8": {"version": "des_y3"}} to use one or the other, not both at once.

__init__(cosmology, version='kids1000')

Methods

__init__(cosmology[, version])
chi2()	Return chi-square.
log_likelihood()	Return log-likelihood.
model()	S8 = sigma8 * sqrt(Omega_m / 0.3).
predictions()	Alias for model().
residuals()
summary()	Return a summary of the likelihood evaluation.

Attributes

n_data	Number of data points.
name_and_size	Name together with the number of data points.
observable