\begin{Schunk}
\begin{Sinput}
 anova(group.out.0, group.out.1)
\end{Sinput}
\begin{Soutput}
Chi Square Difference Test

            Df    AIC    BIC  Chisq Chisq diff Df diff
group.out.1  0 1252.4 1276.0 0.0000                   
group.out.0  1 1253.4 1273.1 2.9781     2.9781       1
            Pr(>Chisq)  
group.out.1             
group.out.0     0.0844 .
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
\end{Soutput}
\end{Schunk}
