momMix
averages the moments of a normal mixture model over MCMC draws.
momMix(probdraw, compdraw)
R x ncomp list of draws of mixture probs
list of length R of draws of mixture component moments
a list of the following items …
Posterior Expectation of Mean
Posterior Expecation of Covariance Matrix
Posterior Expectation of Vector of Standard Deviations
Posterior Expectation of Correlation Matrix
This routine is a utility routine that does not check the input arguments for proper dimensions and type.
R is the number of MCMC draws in argument list above. ncomp is the number of mixture components fitted. compdraw is a list of lists of lists with mixture components. compdraw[[i]] is ith draw. compdraw[[i]][[j]][[1]] is the mean parameter vector for the jth component, ith MCMC draw. compdraw[[i]][[j]][[2]] is the UL decomposition of \(\Sigma^{-1}\) for the jth component, ith MCMC draw.
For further discussion, see Bayesian Statistics and Marketing by Rossi, Allenby and McCulloch, Chapter 5. http://www.perossi.org/home/bsm-1