5</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> x1.1     4.372     0.2287    0.3731     51.24</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> x2.2     2.356     0.4244    0.4160     13.35</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> </span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Concordance= 0.781  (se = 0.077 )</span>
<span class="r-out co"><span class="r-pr">#&gt;</span> Likelihood ratio test= 2.93  on 2 df,   p=0.2</span>
<span class="r-out c