chisq of Union2.1 data with Apr2013 Cosmomc

Use of Cobaya. camb, CLASS, cosmomc, compilers, etc.
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Yuting Wang
Posts: 3
Joined: May 17 2013
Affiliation: National Astronomical Observatories, CAS

chisq of Union2.1 data with Apr2013 Cosmomc

Post by Yuting Wang » May 20 2013

Hi everyone,

Does anyone know why the chisq of Union2.1 data is very small with the new version of cosmomc?

Thanks.
Yuting

Antony Lewis
Posts: 1941
Joined: September 23 2004
Affiliation: University of Sussex
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Re: chisq of Union2.1 data with Apr2013 Cosmomc

Post by Antony Lewis » May 20 2013

About 130?

Yuting Wang
Posts: 3
Joined: May 17 2013
Affiliation: National Astronomical Observatories, CAS

chisq of Union2.1 data with Apr2013 Cosmomc

Post by Yuting Wang » May 20 2013

Yes, I am confusing to get this chisq for 580 data.

Nelson Lima
Posts: 1
Joined: September 10 2014
Affiliation: University of Edinburgh

chisq of Union2.1 data with Apr2013 Cosmomc

Post by Nelson Lima » September 10 2014

Hi, everyone,

I was wondering if anyone knows why this happens. I am using a slightly later version of the code, the Decenber 2013 one, and I keep getting a smaller than expected \chi^2 value for the Union2.1 dataset, around 130. I suppose one would expect a larger value given the number of objects in the sample.

Thank you,

Nelson Lima

Yuting Wang
Posts: 3
Joined: May 17 2013
Affiliation: National Astronomical Observatories, CAS

chisq of Union2.1 data with Apr2013 Cosmomc

Post by Yuting Wang » September 17 2014

Hi,

The reduced chi-square from Union2.1 data was set to unity by introducing the systematic errors. Without the systematic errors, chi-square is small.

Best,
Yuting

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