show summary for all levels even if there are too many to display in one line
...
rv object
Details
The objects are first coerced to rvsummary objects,
then passed on to the summary.rvsummary method,
which creates a nicely formatted data frame of the object.
References
Kerman, J. and Gelman, A. (2007). Manipulating and Summarizing
Posterior Simulations Using Random Variable Objects.
Statistics and Computing 17:3, 235-244.