### CosmoMC: action = 2 vs action = 4

Posted:

**October 28 2016**Hi everybody. I have run CosmoMC setting action = 2 to find the best-fit point. The

Then I fixed the central values of the parameters in the

As can be seen, the results for CMB-lowl, SNe and BAO are very similar, but the results for CMB-highl are very different. Does anybody knows what's going on?

Regards

*minimum*output file lists, besides the best fit values of all the parameters, the information about the total chi-sq and the chi-sq for every data set I used:Code: Select all

```
-log(Like) chi-sq data
7.527 15.053 CMB: lowl = commander_rc2_v1.1_l2_29_B
380.793 761.585 CMB: plik = plik_dx11dr2_HM_v18_TT
347.808 695.616 SN: JLA December_2013
0.008 0.016 BAO: 6DF
0.704 1.407 BAO: MGS
1.102 2.204 BAO: DR11CMASS
0.155 0.310 BAO: DR11LOWZ
```

*ini*file to the best fit values quoted in the*minimum*file and now use action = 4 to calculate the likelihood for this particular choice. I suppose the results of the chi-sq should be very similar. However, I get:Code: Select all

```
loglike chi-sq
7.550 15.100 CMB: lowl = commander_rc2_v1.1_l2_29_B
451.099 902.198 CMB: plik = plik_dx11dr2_HM_v18_TT
347.818 695.636 SN: JLA December_2013
0.008 0.016 BAO: 6DF
0.704 1.407 BAO: MGS
1.102 2.204 BAO: DR11CMASS
0.155 0.310 BAO: DR11LOWZ
```

Regards