Retrieves posterior mean, median, or mode (if available)
getParamCoef(
  fit,
  posterior.summary = c("mean", "median", "mode"),
  what = c("both", "betas", "taus")
)vector of regression coefficients
a Bayesian model fit from rmsb
which summary statistic (Bayesian point estimate) to fetch
specifies which coefficients to include.  Default is all.  Specify what="betas" to include only intercepts and betas if the model is a partial proportional odds model (i.e.,, exclude the tau parameters).  Specify what="taus" to include only the tau parameters.
Frank Harrell