[R] barchart in trellis and NA

[Deepayan Sarkar]

On 6/21/07, Sigbert Klinke <sigbert at wiwi.hu-berlin.de> wrote:
> Hi,
>
> I've a dataset with discrete data and several groups and in one group I
> have also missing values (NA). When I use table and barchart to
> visualize the counts I never get a bar for  NA in the barchart although
> it appears in the result of table. Is there a possibility to get this
> bar too?

Please give a reproducible example, because it's not clear to me what
exactly is supposed to be NA.

-Deepayan