### [CosmoMC/Planck likelihood] Precision

Posted:

**November 20 2018**Dear all,

Does anyone know how precise the Planck likelihood values that we get out of CosmoMC are? When looking at analysis with the likelihood values, it's really important to know what the actual precision is so we don't get dominated by noise in the numerical analysis. Does anyone know how accurate the likelihood values are (i.e. of the 6466.xxxxxx for the best fit value I have for a given parameter set, what is the number of d.p. one can go to before this becomes noise dominated)?

Thanks in advance for your help

Luke

Does anyone know how precise the Planck likelihood values that we get out of CosmoMC are? When looking at analysis with the likelihood values, it's really important to know what the actual precision is so we don't get dominated by noise in the numerical analysis. Does anyone know how accurate the likelihood values are (i.e. of the 6466.xxxxxx for the best fit value I have for a given parameter set, what is the number of d.p. one can go to before this becomes noise dominated)?

Thanks in advance for your help

Luke