\begin{Schunk}
\begin{Sinput}
 ## How does it perform when sample sizes are equal?
 output[output$N == "30:30",]
\end{Sinput}
\begin{Soutput}
      N    SD Type.I.Rate
1 30:30 10:20       0.044
3 30:30 15:15       0.053
5 30:30 20:10       0.041
\end{Soutput}
\begin{Sinput}
 ## Unequal?
 output[output$N != "30:30",]
\end{Sinput}
\begin{Soutput}
      N    SD Type.I.Rate
2 40:20 10:20       0.108
4 40:20 15:15       0.050
6 40:20 20:10       0.012
\end{Soutput}
\end{Schunk}
