\begin{Schunk}
\begin{Sinput}
 ## Note the attributes stored with the data frame:
 attributes(dframe1)
\end{Sinput}
\begin{Soutput}
$names
[1] "first" "IQ"   

$row.names
 [1]  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
[33] 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

$class
[1] "data.frame"

$rep
[1] 1

$parms
       N        M       SD 
 "30:30" "98:102"  "15:15" 
\end{Soutput}
\begin{Sinput}
 ## Individual attributes can be retrieved
 attr(dframe1, "rep")
\end{Sinput}
\begin{Soutput}
[1] 1
\end{Soutput}
\begin{Sinput}
 attr(dframe1, "parms")
\end{Sinput}
\begin{Soutput}
       N        M       SD 
 "30:30" "98:102"  "15:15" 
\end{Soutput}
\end{Schunk}
