class='fu'><a href='http://www.rdocumentation.org/packages/rms/topics/cph'>cph</a></span>(<span class='fu'>Surv</span>(<span class='no'>years</span>, <span class='no'>status</span>)~<span class='no'>.</span>, <span class='kw'>data</span><span class='kw'>=</span><span class='no'>pbcTrain</span>, <span class='kw'>surv</span><span class='kw'>=</span><span class='fl'>TRUE</span>, <span class='kw'>x</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>y</span><span class='kw'>=</span><