Calculating reduced chi square

Use of Healpix, camb, CLASS, cosmomc, compilers, etc.
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Archita Bhattacharyya
Posts: 3
Joined: August 02 2017
Affiliation: Indian Statistical Institute Kolkata

Calculating reduced chi square

Post by Archita Bhattacharyya » November 02 2018

Hi,

I want to calculate reduced chi square for some cosmological model using Planck TT and low l 2015 data.

Can anyone tell me what should be the no. of data points for that?

Thanks and regards,
Archita

Antony Lewis
Posts: 1444
Joined: September 23 2004
Affiliation: University of Sussex
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Re: Calculating reduced chi square

Post by Antony Lewis » November 05 2018

You could just count the number C_L multipoles used. However the log likelihoods are not all normalized in a way that makes calculating a directly comparable chi2 possible (the lowTEB likelihood is not based on C_L).

Archita Bhattacharyya
Posts: 3
Joined: August 02 2017
Affiliation: Indian Statistical Institute Kolkata

Re: Calculating reduced chi square

Post by Archita Bhattacharyya » November 05 2018

Thanks Antony!

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