\begin{Schunk}
\begin{Sinput}
 head(error)
\end{Sinput}
\begin{Soutput}
[1]  0.06315714  3.51111143 -7.30378820  0.13006657 -4.77096913 -0.33498189
\end{Soutput}
\begin{Sinput}
 mean(error)
\end{Sinput}
\begin{Soutput}
[1] -0.03904841
\end{Soutput}
\end{Schunk}
