The clustering of galaxies in the completed SDSS-III Baryon Oscillation
  Spectroscopic Survey: combining correlated Gaussian posterior distributions
  The cosmological information contained in anisotropic galaxy clustering
measurements can often be compressed into a small number of parameters whose
posterior distribution is well described by a Gaussian. We present a general
methodology to combine these estimates into a single set of consensus
constraints that encode the total information of the individual measurements,
taking into account the full covariance between the different methods. We
illustrate this technique by applying it to combine the results obtained from
different clustering analyses, including measurements of the signature of
baryon acoustic oscillations (BAO) and redshift-space distortions (RSD), based
on a set of mock catalogues of the final SDSS-III Baryon Oscillation
Spectroscopic Survey (BOSS). Our results show that the region of the parameter
space allowed by the consensus constraints is smaller than that of the
individual methods, highlighting the importance of performing multiple analyses
on galaxy surveys even when the measurements are highly correlated. This paper
is part of a set that analyses the final galaxy clustering dataset from BOSS.
The methodology presented here is used in Alam et al. (2016) to produce the
final cosmological constraints from BOSS.
