\begin{Schunk}
\begin{Sinput}
 cond.N <- c("30:30", "40:20")
 cond.SD <- c("10:20", "15:15", "20:10")
 cond.M <- c("100:100") # for now, mean-difference = 0
 conds <- expand.grid(nReps = 1000, SD = cond.SD, N = cond.N, M = cond.M,
                       stringsAsFactors = FALSE)
 head(conds)
\end{Sinput}
\begin{Soutput}
  nReps    SD     N       M
1  1000 10:20 30:30 100:100
2  1000 15:15 30:30 100:100
3  1000 20:10 30:30 100:100
4  1000 10:20 40:20 100:100
5  1000 15:15 40:20 100:100
6  1000 20:10 40:20 100:100
\end{Soutput}
\end{Schunk}
