### Custom Covariance Matrix Question

Posted:

**August 29 2019**Hi everyone,

I am currently working on a project using cosmomc and I want to separate the data in two different categories. The first one consists of BAORSD+DES+lowl data and the other one of highl+BAO+Pantheon+HST data. I have successfully obtained the following contours for the first set of data but as you can see clearly from the following picture they are not at all smooth.

https://imgur.com/a/zeoXTd9

where [math] is an extra parameter of my model. In my analysis in the test.ini file I have set the propose matrix to be

Could it be because the covariance matrix does not correspond to the specific combination of data? I have searched the folder planck_covmats but I can not find the specific combination that I want. I am not sure what changes should I make in order to obtain an accurate covariance matrix corresponding to the exact combination of data. Is there an easy way to do that?

Thank you in advance,

Lawrence.

I am currently working on a project using cosmomc and I want to separate the data in two different categories. The first one consists of BAORSD+DES+lowl data and the other one of highl+BAO+Pantheon+HST data. I have successfully obtained the following contours for the first set of data but as you can see clearly from the following picture they are not at all smooth.

https://imgur.com/a/zeoXTd9

where [math] is an extra parameter of my model. In my analysis in the test.ini file I have set the propose matrix to be

Code: Select all

`propose_matrix= planck_covmats/base_BAO_HST_JLA_TT_lensing_lowTEB_plik.covmat`

Thank you in advance,

Lawrence.