\begin{Schunk}
\begin{Sinput}
 anes1$V043116 <- anes1$V043116[, drop = TRUE]
 table(anes1$V043116, exclude = NULL)
\end{Sinput}
\begin{Soutput}
  SD   WD   ID    I   IR   WR   SR <NA> 
 203  179  210  118  138  154  193   17 
\end{Soutput}
\end{Schunk}
