bject containing the needed time-to-event data in standard format. Ideally, this data set should only contain required variables. Can also be a <code>mids</code> object created with the <span class="pkg">mice</span> package. See details for how this works.</p></dd>
<dt>variable</dt>
<dd><p>A character string specifying the variable by which the survival curves should be grouped. Must be a valid column name of <code>data</code>. The variable specified should ideally be a factor variable, but integers also wo