# Local measurement of H0¶

Synopsis: Prototype class for local Hubble parameter measurements Jesus Torrado

This is a simple gaussian likelihood for the latest local $$H_0$$ measurements using a combination of different data.

It defines the following likelihoods

• H0.riess2018a: A legacy local measurement of $$H_0$$, used in the analysis of Planck data for the Planck 2018 release. (arXiv:1801.01120)
• H0.riess2018b: Updated local measurement of $$H_0$$. (arXiv:1804.10655)
• H0.riess201903: Riess et al. 2019 constraint (arXiv:1903.07603)

## Using a different measurement¶

If you would like to use different values for the $$H_0$$ constraint, as a mean and a standard deviation, simply add the following likelihood, substituting mu_H0 and sigma_H0 for the respective values:

likelihood:
my_H0:
external: 'lambda _self: -0.5 * (_self.provider.get_param("H0") - mu_H0)**2 / (sigma_H0)**2'
requires: ["H0"]