an>

<span class='va'>DS</span> <span class='op'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/data.frame.html'>data.frame</a></span><span class='op'>(</span>
 USUBJID <span class='op'>=</span> <span class='fl'>1</span><span class='op'>:</span><span class='fl'>4</span>,
 DSTERM <span class='op'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span><span class='op'>(</span><span class='st'>"DEATH DUE TO ADVERSE EVENT"</span>,<span class='st'>"DEATH DUE TO PROGRESSIVE D