ebhistoricalsummary from the
method summary.ebhistorical in a nice form.
"print"(x, ...)ebhistoricalsummary (e.g., the output of
function summary.ebhistorical).sumstat.
ebhistoricalsummary returned by the method
summary.ebhistorical, which creates its own class of object much like
the summary method for lm objects. There is an additional plot method that
will plot the summary output called plot.ebhistoricalsummary.