[R] Excluding all missing values with dcast ("reshape2" package)

[Michael.Laviolette at dhhs.state.nh.us]

Hello--I'm doing a simple crosstab using dcast:

rawfreq <- dcast(nh11brfs, race3~CHCCOPD, length)

with the results

               race3 Yes   No NA
1 White non-Hispanic 446 5473 21
2 Other non-Hispanic  29  211  0
3           Hispanic   6   81  1
4               <NA>  10   83  1

How would I modify this call to exclude all missing values; that is, to
obtain

               race3 Yes   No
1 White non-Hispanic 446 5473
2 Other non-Hispanic  29  211
3           Hispanic   6   81

Apologies if this has come up before, and thanks.

-M.L.