\begin{Schunk}
\begin{Sinput}
 drop1(mod1, test = "F")
\end{Sinput}
\begin{Soutput}
Single term deletions

Model:
y ~ xnum1 + xcat2 + z
       Df Sum of Sq    RSS     AIC F value    Pr(>F)    
<none>              61.453 -36.690                      
xnum1   1   21.3306 82.784  -8.894 32.6278 1.302e-07 ***
xcat2   1    0.0009 61.454 -38.688  0.0014   0.97001    
z       3    6.3877 67.841 -32.801  3.2569   0.02505 *  
---
Signif. codes:  0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
\end{Soutput}
\end{Schunk}
