Argument to pass to format(), if a formatted string is desired.
scientific
Argument to pass to format() if big.mark is specified. Defaults to FALSE, unlike in format().
...
Other arguments to pass to format(). Ignored if big.mark is not specified.
Details
This function just shorthand for sum(!is.na(x)), with a shorter name for reference in the vtable or sumtablesumm option.
If big.mark is specified, will return a formatted string instead of a number, where the formatting is based on format(x, big.mark = big.mark, scientific = FALSE, ...).