If supplying a data frame as data, the names of the
columns to process.
itemLabels
Optionally, labels to use for the items (optionally, named,
with the names corresponding to the items; otherwise, the order of the
labels has to match the order of the items)
conf.level
The confidence level of the confidence intervals.
digits
The number of digits to round the output to.
x
The object to print (i.e. the object returned by descriptiveCIs).
forceKnitrOutput
Whether to force knitr output even when
not knitting.